I can't recommend Scott's place enough if you're planning to stay in London and want to save money by being a little further away from the city. The apartment was clean, stylish and had everything you need for your stay. Both the couch and bed were very comfortable (my friend and I shared the apartment -- the bed was large enough where two people could share easily but we wanted to spread out a bit so we decided to split the apartment up).
Scott's place is very conveniently located -- a short walk to either the Victoria line at Brixton (which goes directly to King's Cross) or the Northern line at Clapham North (which gets you to East London easily enough). There are a lot of cute pubs (Duke of Edinburgh) and restaurants and cafes (500 Degrees London, Kaboola, Balance Cafe) within walking distance as well.
Overall, the next time I'm back in London, I'm definitely going to see if Scott's place is available as I fell in love with the apartment and Brixton, too!