Our stay at Elena's flat was perfect. Elena is a very welcoming host and did whatever was in her hands to make our stay perfect. The flat is so nice. I'd say that it is even better than the pictures! In a perfect location, so close to a tube stop, and with plenty conveniences nearby: supermarket, cafes, swimming pool, gym...
I'd recommend Elena's apartment to whoever is considering a quiet stay in London, in a nice and very safe area.