It's actually pretty clever and kind of cute... but I would rather get an RV or maybe even a roomy tent. Of course, it's in London. It's about the same size as my 2 smallest bedrooms put together; I think if I were designing it, I might give myself a little larger bathroom, and use a futon for the living room and sleep there. Maybe use the above area for storage?
https://homes.yahoo.com/photos/photos-a ... slideshow/