I booked Leo's place at a rather critical time (my other place where I was supposed to stay had a very serious leak so the flat was full of water with soaked beds etc...and it wasn't something I expected to find after coming back from the airport at night). Leo allowed me to check in at 2 in the morning and even made some tea :)
The room is on the lower ground floor, good size with your own bathroom. The place is literally 3 mins walk from the Streatham Common train station.
Highly recommended!