Very nice and clean place located in Battersea. Located in a calm neighbourhood which does not feel particularly touristy. Even though it is a basement-level unit, it gets a lot of light due to the big windows. Very convenient if coming from Gatwick, as the Clapham Junction rail station is less than 10 minutes walk away and takes you straight to it. No subway stops nearby, but plenty of buses which will take you into the city (as well as the aforementioned rail stop).
The only drawback I can think of is that the smaller bed was not very comfortable -- hard with noisy metal springs that could be felt through the mattress. So if you are a light sleeper, opt for the larger bed instead.
All in all, highly recommended!