Having stayed in a studio at BWV and also at OKW I have to comment that the size is really not very different. It is hard to make an accurate comparison because the rooms are shaped very differently--BWV is more long and narrow while OKW is more square. The bathroom in BWV is much tinier though!! The closet there is very hard to use since part of it is "hidden" behind the sink), there is no storage under the beds (if that is important to you) and the drawer space is limited (although I did hear that the dresser units were being replaced with larger units.) For two people, the BWV units would be more than sufficient. You'd have the sofa and a bed. But if you are considering 3 or 4 people , the OKW studio seemed to function better for us.