Very nice apartment, good location and close to restaurants, shops and public transport. Nana was communicative and her nuce neighbours helped as well. We would have rated the place 5 out of 5 if it wasn't for one issue - the summer heat. One should keep in mind that during hot days, and London was hot during our stay, it is impossible to stay in the apartment after 9:00 and the one small fan provided didn't cope...
But, I would come back and stay at Nana's at cooler seasons...