I just want to offer up a suggestion for those who are taking along an air mattress. Consider making a sheet sleeping bag. It will be much easier to make up every evening and doesn't have to stay tucked in. We did this for DS during our trip in 2008. DH was a big guy (not so big any more

) and takes up a full bed himself. DD and I are okay with sharing, but DS couldn't really fit with us. I bought an inexpensive Coleman single air mattress at
Walmart (we already had a pump). I tried to buy a kids size one to save even more space, but couldn't find a good quality one.
Anyhow, I took an extra king-size flat sheet and sewed it up with a basting stitch to create a sheet sleeping bag. It laid right over the top of the air mattress and made it super easy for DS to just toss it over the mattress at night and climb in! We requested an extra blanket for the room and there were plenty of pillows to share. When we got home I just unstitched it and we had our flat sheet back again!
I know that they sell silk sleeping bag liners out there (to use with sleeping bags), but they are very pricey.
In the morning we just folded the extra blanket, tossed the pillow on the bed, and folded the sheet sleeping bag and tossed it in a drawer. Then we propped the air mattress against the wall. We did this at Pop.... and YES the rooms are small.... but like a few other mentioned, we weren't in the room other than for sleeping and showering in the morning. As I recall, I did have to do a bit of rearranging of the table and chairs to fit the mattress comfortably along a wall, but it wasn't any trouble. And EVERYONE got a good night's sleep!! ....................P