The apartment is in a good location. Conveniently close to the tube, but far enough from the main roads to be well insulated from noise etc. It's in a nice building in a nice street.
There were a few areas which could be improved on for tidiness. As others have said before there are a reasonable number of areas that could do with just a bit of paint. Which is not something I would usually mention but there are quite a few areas, some of them are quite jarring in what could otherwise look quite a tidy apartment. There were also items presumably left from other guests in the drawers such as a coat and a packet of contact lenses. Again not really a problem but it does make you question how well the place has been cleaned between guests.
More problematic are the couple of safety issues we felt the apartment had. As described by other reviewers, the railing at the side of the bed is damaged - one of the sections is bent, and at several of the points where the railings are attached the fixings have become detached. I would point out that even if they were whole and undamaged they are, at their upper height, at the same level as the mattress. We felt uncomfortable with the idea of two people in the bed given how unprotected the roughly 10 foot drop was, and would strongly suggest the hosts should look into raising the height of the barrier. The handrail for the steps leading up to the main bed were also a little shaky. Finally, the benches for the table were also a touch on the wobbly side which didn't really give great confidence to sit on them.
All of that is not to say it was a bad place to stay. It wasn't perfect or particularly close to great, but it was perfectly adequate (bedside barrier height aside), and I would also add that the communication with the hosts prior to the stay was really good.