Three things that separate this AirBnB: Neo, Location, Mattress. Firstly, Neo's one of the more genuine and accommodating hosts I've found through this site. He knows London (among other things) and is happy to share his expertise.
The location: you're a short walk to two stops on the Northern line and between Camden (a hipper area) and Belsize Park (more posh). Great cafés right down the street, a quick walk from Primrose Hill (a great view of the city).
The mattress is a memory foam and one of the best I've ever slept on.