Sally and Sean are very nice and friendly hosts, they took care of everything and I really enjoyed my stay at their home! The room is spacious, the bed is very comfy, the bathroom very clean and modern, so actually there's everything you need - and a sumptuous continental breakfast as well. The view from the window is also interesting (and running Underground trains won't disturb you). The house is located in a very quiet and safe neighbourhood, you can reach the Southfields station (District Line) in 7-10 minutes by foot and make some shopping at Tesco or Sainsbury's.
If you hesitate, really don't do it, just book your stay at Sally's and Sean's house and you won't be disappointed :-)