I stayed in a King bed room at ASMu back in Feb 01. I have no clue why they put me there, but the room DID seem larger with just one bed in it, even though it was a King.
The neat thing was that the bathroom was larger. It had a "pocket" door (the kind that slides in and out of the wall) and a roll-in shower. I was a little disappointed because I missed my bathtub. I like to soak in a fragrant bubble bath late at night after being at the parks all day, but I got used to the shower.
If you need an extra bed for a child or another adult, would it be possible to remove the table & chairs or scoot the furniture around to accomodate a roll-away bed? You could ask. This way (I have no idea what disability you're talking about) you could still keep your roll-in shower AND have a third person with you.