Many positives, 2 small negatives.
The positives are the excellent location, close to the tube and lots of shops.
The place was incredibly quiet - no noise from neighbours or passing traffic.
The flat, including the bathroom, was clean, perfectly satisfied on that front.
The host responded quickly. We were 3 individuals staying there, not a couple + 1, and the host promptly arranged a 3rd set of bedding for the 3rd person, very straightforward to deal with.
The 2 negatives are 1) the water pipes are very noisy, so _might_ be a problem if 1 person is a light sleeper and another uses the bathroom late at night, etc. The 2nd issue is that one of the bedrooms has no windows.
As others have mentioned, it is a small flat, but you can see this from the photos. Both bedrooms open onto the living room, in case the layout is not clear from the photos.
Overall, I would absolutely consider staying there again - I had to deal twice with the host and he's acted fairly, and the quietness of the place was exceptional, as well as the other positives written in this review. The 2 possible downsides I wrote about, I can live with those. There were no nasty hidden surprises, which you sometimes hear about at other airbnb's.