A medium pocket-spring mattress suits the widest mix of guests
Medium tension is the sensible all-comers option when you don't know your guests' preferred firmness or sleeping position. Your own bed can suit your body closely; the spare has to accommodate different people for a night or two. Nobody needs a pre-arrival questionnaire with their invitation to Sunday lunch. Start in the middle, with enough give at the surface for someone sleeping on their side.
Medium describes the feel, while pocket springs describe what's underneath. Each pocket spring compresses separately, so one guest's weight has less effect on the space beside them. That matters when two people share: they should be able to settle on their own side without rolling together. A hybrid adds a comfort layer, such as foam or latex, over the springs.
To my mind, the ability to share comfortably is worth more than a fancy surface finish. Romance is lovely; being tipped towards each other all night is less of a hosting achievement. Choose pocket springs for a regularly shared guest double, and check that the edge feels stable when you sit down or lie close to it.
Firmness labels vary between makers, so treat "medium" as a place to begin your comparison. If you visit a shop, spend ten minutes lying as you normally would on a possible guest mattress. You can rule out something obviously hard or deeply enveloping without pretending you know how every future visitor will sleep.
| Your usual guest arrangement | What I suggest | Why it fits |
|---|
| Different visitors, sometimes sharing | A medium pocket-spring mattress or hybrid | A middling feel accommodates a range of positions, while separate springs help keep each guest on their own side. |
| One occasional guest and a tight budget | A straightforward medium mattress; open coil is acceptable | You spend less, and movement across the bed matters less with one person sleeping on it. |
| The same visitor who prefers a softer surface | A medium mattress with a removable topper available | You can soften the surface for that guest without making the bed permanently softer for everyone. |
You can skip the elaborate top, but the bed must be level
A level, supportive mattress on a sound base matters more than deep comfort layers in a bed used occasionally. A guest mattress gets a fraction of the use of your main bed, so wear is slower and an expensive top adds little value for short stays. I think this is where you can be cheerfully unromantic about mattress shopping: a sensible construction is quite enough.
Skip the deep pillow-top and the fancy cover. You will cover the mattress with bedding anyway, which does rather spoil the sales demonstration involving a lovingly stroked fabric sample. A modest comfort layer is enough to soften the surface; you don't need a thick layer of foam to make an occasional bed welcoming.
Huge spring counts are another place to save. Beyond about 1,500 in a king, I care much more about the spring construction and fillings than another impressive-looking number. Check whether the count includes several layers of small springs, because counting every spring tells you little about how the main support feels.
A long trial deserves less weight in this purchase because your visitors will do the sleeping, and they may arrive too infrequently to make much use of it. Don't pay extra just for a lengthy trial. Do read the returns terms before ordering, including whether an opened mattress can go back and who pays for collection. A guest's polite "lovely, thanks" is a fairly limited testing programme.
The saving stops at an existing dip. Your retired mattress is suitable for the spare room only if it's still level and comfortable. Moving a sagging mattress down the landing doesn't improve it. Check the base too: a broken slat or a dipped support can leave you sinking even after you've bought a replacement mattress.
Open coil is acceptable for an occasional single guest when money is tight. Its springs are linked, so movement travels across the bed, and over time the middle can dip into that familiar trench. For two guests sharing every visit, spend the extra on pocket springs if you can.
Honestly, a good second-hand mattress from someone whose care of it you trust can be a better buy than a poor new one, provided you're satisfied with its cleanliness and condition. A guest room is where that makes the most sense. Keep that separate from furnishing a child's bedroom: children get a proper new mattress, and a guest-room saving shouldn't become the family hand-me-down policy.
Good pillows and fresh bedding do more for the welcome
Buy two decent pillows before you pay for a mattress upgrade, because a guest notices a flat pillow straight away. You can put beautiful linen on it, but they're still folding it in half by bedtime. Choose pillows with some shape left in them, and offer a different height if you have a spare so your visitor can settle comfortably.
This is also one of the places I'd use a mattress protector. I'm usually wary of adding a layer that hampers breathability, but you're looking after a bed between other people's stays. A washable, breathable protector is a sensible compromise. Check its care instructions and avoid a thick, plasticky feel that makes the bed warmer or less comfortable.
A closed spare room gets musty, however nice the bedding looks. Open the window and pull the duvet back for a few hours before guests arrive, then do the same after they leave. Wash the bedding between visitors. You don't need a bloody pillow spray to make a room smell as though somebody opened the window.
Keep a removable topper in the cupboard if you have space. It can soften a medium mattress for someone who prefers more cushioning, including a guest with a bad back who already knows that a softer surface feels better to them. Ask what they find comfortable before adding it; extra softness isn't automatically what they want.
A topper cannot firm up a soft base or repair a sagging mattress. It follows the shape underneath, so adding one over a dip still leaves a dip. The useful guest-room arrangement is a sound mattress with an optional softer surface, which you can remove and store between stays.
Measure the route upstairs and leave time for the mattress to expand
Choose delivery you can get through the house, and have a rolled mattress fully expanded before the first guest arrives. A roll is easier to carry up a narrow stair than a full-size mattress, but you still need to check the package dimensions against the doorway and the turn on the stairs. Discovering the problem halfway up is an ambitious way to begin a family weekend.
Check the maker's expansion instructions before choosing a delivery date. Unpack the mattress in the room where it will be used, give it the full stated time and air the room. Delivery on the afternoon your guests arrive leaves very little room for a delay or a mattress that needs longer to take shape.
For an office that occasionally becomes a bedroom, measure the usable room with the bed ready for sleeping. Your visitor needs a route to the door without climbing over the desk chair, and somewhere to put a bag. The desk can keep its impressive cable collection, but move it clear of the walking space before anyone arrives.
A sofa bed is a fair compromise for a night or two, especially with a topper over an otherwise sound sleeping surface. The same goes for a caravan bed that feels a little too firm. For longer stays, choose a proper bed where the room allows; a topper can improve the surface but leaves you with the same sofa-bed mechanism underneath.
Check where the bedding and topper will go when the office is back in use. An ottoman base can help in a small room, provided you have space to open it. If you choose a metal frame, check the joints for movement and squeaks before the visit. Midnight is a poor time to discover how much noise a loose frame makes.
Avoid a shared open-coil bed and anything with a dip
Rule out visible sagging first, then spend according to how often two people will share. The spare room is a reasonable place to economise; it isn't where every uncomfortable thing in the house needs to finish its career. These are the shortcuts I would leave alone:
- Open coil for a double shared on every visit. The linked springs pass movement across the bed, and a dip in the centre encourages both guests towards the middle. On a tight budget for a single visitor, it's acceptable.
- Your old mattress with a permanent dip. A topper won't level it out. Check the base for damage before deciding whether you need to replace one or both.
- A deep memory foam top in a room that's cold most of the year. Memory foam feels firmer when cold and softens with warmth. It also holds warmth around the sleeper, so a simpler surface is the safer all-comers purchase for guests who sleep hot.
- A bare mattress without a protector. Use a washable, breathable protector on a bed you're caring for between visits, while keeping the added layer as unobtrusive as possible.
- A flat, old pillow on a good new mattress. The decorative cushions can audition for the photographs. Give your guest a sleeping pillow that still has enough shape to support their head comfortably.
