We stayed in a one bedroom last August and it had a regular size tub with Jacuzzi jets in it. It felt great but I don't know if all units have one.
The unit itself is very nice (I have pictures if you are interested). We are a family of four, DD's were 3 and 4 at the time. They used the pull out queen sofa in the living room. The living room has a nice sized TV and DVD player and the TV entertainment unit had enough drawers that we were able to unpack and put all their clothes away in it. We had a king size bed in our room.
I don't know the exact size, but it is much bigger than a room at ASMo and bigger than the studios at the Beach club. The kitchen is ample sized and well stocked. The bathroom is a good size too.
We loved it there.... we didn't do any of the activities (lack of time), but there seemed to be lots of stuff going on.
Have fun..