I loved my stay in Angel's homely house in Battersea, with a warm hostess, very comfy bed, super clean bathroom and two sweet dogs.
The street is very quiet so it's a sanctuary to come home to, and room is spacious with a sofa and aforementioned bed that I didn't want to get out of!
Only downside was patchy wifi, but if you're looking more for a space to relax after sightseeing than doing any work, you'll love it!
Easy to find from Battersea station and Queenstown road station has fast trains to Waterloo.
I'll happily return next time I need a cosy, comfy place in London.