I think you're going to get a variety of answers. We stayed in a BWV studio with two adults and three 5 year olds. There was plenty of storage room for our luggage and clothes, the space itself was tight but manageable, and we utilized the balcony when we needed to spread out.
The single bathroom is probably the biggest drawback but we made it work as a family of quick showerers with minimal beauty routine (hair in pony tail, no make up).
I would choose a studio with a monorail or crescent lake location over having more space at a less convenient resort.