We have a sofa bed in lounge. Hasn't been used yet but it's there as an option.

We have futon in study that gets used fairly regularly. It's not something I'd sleep on long try but for a night or toe it's ok. And the couch is quite nice/comfy when it's folded up (I think it's referred to as a click clack bed/sofa more than a futon). It has storage underneath too so the pillows/blankets get stowed easily. Takes no more than a few minutes to set up.

DD has a double bed, and her girl cousins usually crash with her when they stay over.

Spare single bed mattress that comes out when dd is unwell and wants snuggles watching tv or when boy cousin stays over. Goes in floor in end bedroom. Small mattress from truck does the same. DH's bestie/dd's godfather happily crashes on either of these mattresses in the floor. Kids are happy to do the same. It's easy to set up and out away

Have a queen size air mattress that can go in the formal lounge/bar if needed. Hasn't been needed yet though.