We stayed a month while looking for a flat. The location is quite convenient to get the tube into central London but it is right on a busy road so is noisy enough to have to close all the windows up at night if you're not used to that.
Another guest mentioned the water pump being noisy. It is, but only when the water is running, so for us it was only a minor annoyance while the other of us was showering or popping on for a moment when the toilet was flushed.
John and Susan were very considerate hosts, quick to answer any questions, right on time with checkin and did regular changes of linens and towels. It's been a very hot summer and John kindly got a fan for the apartment just after we moved in to help us keep cool.