Diane is an excellent host and Clapham South is a well-located area for the Common and the Tube station, 5 mins walk. (Northern line: 1 stop to hoppin' Clapham Common, 1 to trendy Balham, not more than 20 minutes to Waterloo or London Bridge, 25 to Bank or Leicester Square.)
There are a few decent takeout places near the Tube and 3 supermarkets (Tesco, Sainsbury, Marks & Spencer).
From the end of the street are buses to Brixton and Streatham, and <10 mins walk to the very nice Abbeville Road market/shopping/cafe/restaurant area - well worth visiting.
The apartment itself has all you need. Really ample space for a London 2BR. The bathroom is nice and spacious, with bath and shower, and the water is hot. Kitchen is well-equipped. Heating is good. Tv: iPlayer & Netflix, no cable or air. Internet is fast. The area is safe & quiet, despite the many young people who live all round. I highly recommend Diane as a very communicative & responsive host!