I can't find anything that indicates the square footage of these rooms.
Here's what I can say from experience-the room we always stay in is an Inn Ocean View room and it is quite roomy. A lot bigger than any hotel room we usually stay in.
It is bigger than the standard hotel rooms at WL and AKL in Orlando.
I believe, but don't quote me, that the Inn Ocean View rooms are bigger than the studios in the villas.
This is just from the pictures that I have seen. My MIL had a studio booked last October and they ended up giving her a garden view room in the Inn and that was a little smaller than the ocean view room we were staying in-I don't know why-it was on a corner and I'm sure not every room in the Inn is the same size.
Anyway, the room we always stay in is 2216 and we find it roomy. There are 2 queen beds and there is actually more than enough room to add a couch or daybed near the balcony but they do not have this in that room.