We have a guest room with twin beds and an office with a full pull-out couch for company, but have had to put an Aero bed in the sewing room once or twice. Not much floor space but a twin will work. We often dog sit for our daughter's English Mastiff and he accompanies me in the sewing room as our two Golden pups overwhelm him, so have to have enough floor room.........barely. When her lab was still with us, she used to sleep right next to the ironing/cutting table which made quite the stretch for me. What we don't do for our pets/kids!
At Christmas we gave our kids our Master bedroom which is quite large, because they have so much STUFF (luggage, two young kids and two German Shepherds with crates). DH and I took the guest room but had to move everything except the beds into the sewing room to accommodate the Goldens crates. Needless to say, there was no sewing that week! Back to normal now but I do need to revamp the sewing room to add another table for a second sewing machine.