We really enjoyed our stay at Ash's place. The flat is really lovely and charming. We loved Balham, some nice places to eat near Balham High St and there is a great big park 1 min from the flat. We saw squirrels and foxes on an early morning walk! The flat is also an easy 5-10min walk to Balham station and then it's quick and easy to get into central London.
One thing to note is that the smaller bedroom has a single bed that can convert to a double but then it's really quite squished in that room and the door won't close. We ended up changing it back to a single and using the sofa in the living room which converts to a very comfortable double bed.
Ash's friend Angelika greeted us and explained everything to us and she was very nice and easy to stay in contact with.
We would definitely stay at Ash's place again :)