I really enjoyed staying at Dave's place. The appartement is great, very clean and tidy. It is only five minute walk from the Metro station Tooting bec. The neighborhood is great with a lot of supermarkets, restaurants etc. I recommend the Joyce Café Balham (2 min walk from Dave's place) for English breakfast where you will also find vegetarian options. There are also a lot of Indian restaurants but I particularly recommend the Balham social restaurant which is located in the main avenue.
Dave is also very nice, welcoming and replied very quickly to me when information was needed. I really recommend that place!