My 10yo ds is having his 12yo friend over tonight for a sleepover, but we don't really have a good set up. Both of my boys share a small bedroom, and each has a twin bed. I could put our extra twin bunkbed mattress on the floor between the two, but it would be a bit tight.
We have a rec room downstairs, and I could put our camping sleeping pads down there and have the boys sleep in sleeping bags. The rooms not really all that put together - just a bunch of toys every where.
When my ds sleeps at his friend's house, they share his double/queen bed, which we don't have.