I had an amazing stay at Margaret's place: the neighborhood is quiet, but still close to the centre of Ealing - 5mins walking distance from the closest underground station.
The room was spotless, very bright and clean. Also, the bed is amazing - one of the best I've tried so far!
Margaret was a polite and attentive host, she provided everything I needed without even asking for it.
Needless to say, I highly recommend her room for your stay in London.