I stay with my 10 year old son and he and the host James got on immediately.
He is helpful, smart and easy to converse with. We enjoyed coffee and a chat in the morning, then he left us to our day giving us tip on how to get around and good places locally to grab a bite or catch a bus.
We never felt like we were imposing.
The flat is charming, clean and when we returned from a day's trekking around London we immediately relaxed.
My son loved the mezzanine above the living room.
There is some street noise from the road below the living area and the occasional chopper from the heliport close by, but it's by day really and we slept through the nights. I'm from a very quiet neighbourhood so I probably notice more than others would.
I'd have no hesitation in recommending it to friends and would stay again.
(P.s. Make sure to visit the bakery across the street!)