Some of the space is corridor though - look at bedroom 3. I don't think it's small, but the bedrooms are oddly shaped (bedroom 4 is a single) and there is a lot of wasted space. What would you do with such a large entrance lobby, for instance? A four bed house is a family home, not a mansion for entertaining, so why do you need space for people to wait until you're ready to receive them? And whatever is a 'multi-purpose room'?
I wonder if the 4000 sq feet includes the outside space? There are a lot of balconies and walled areas.
I do like the outdoor kitchen, though. I have no idea how often I'd use it - very rarely, probably but I like the idea of it.