We had an amazing stay at Julies place - the room was clean and we had the privacy we needed as the room is located on the upper floor. The place is perfect for couples, friends or single travelers. Julie was also very friendly and helpful, and was happy to give us some local advice on where to eat nearby.
Balham is located only a short trip with the tube from central London. It was nice to be able to return to such a calm area after long days of tourist activities!
Overall we would very much recommend staying at Julie's!
(If think you might have trouble with internet connection on your phone when in Great Britain, you should ask Julie about the house number before you leave - we struggled a little with finding the exact house.)