It's a really small studio. Downstairs there's not much room to move or put stuff if sofa is open, and upstairs the surface is really close to celing (some people may get claustrophobic).
Otherwise good - nice host, easy check in, has all the essentials, close to tube, quiet residential neighborhood.
Recommendable if you're young in spirit and have limited luggage, I would happily stay again if only coming for a night or two.