The pull out chair doesn't fit. I don't think the room is (much) smaller, but I think the kitchen has a little bigger footprint than in some of the other resorts.
Those hideabed chairs are BIG.
A lot of people bring an air mattress, although if you pull out the bed, finding a spot for an airmattress can mean putting it in the kitchen. But wearing them out until they drop tends to be a pretty successful strategy for young kids at Disney (as teens, we had to move to a two bedroom so they each got their own bed).