We stayed in the apartment for 3 nights during a vacation in London. A great benefit of the Airbnb is the location. There are many restaurants in the area and Hyde Park is a 2 minute walk away, so it's great to go there in the morning to start the day and continue with bus connections from the nearby stop. The airbnb itself is OK equipped, but you can tell that it's an old apartment that is not maintained to the highest standards. The windows, doors and floors don't isolate too well (can easily hear when the basement apartment underneath is having a party), the toilet is a bit wobbly and the shower is a bit weak.
A major issue for us was the heating system, which is centrally controlled by the building and set quite high. With the bed located just beneath the ceiling and all the hot air going up it became extremely hot during the night (we were there in April, with mild temperatures outside), making it quite hard to sleep. We contacted the host about this issue, who told us that the heating cannot be turned off, but we can open the window or use the air fan that is provided in the apartment. Both options didn't really solve the issue. Opening the window has the side effects of letting in noise and light from the outside (not great in a ground floor apartment right on a junction) and didn't cool the apartment much and using the fan helped a little bit, but felt more like it just moved the hot air around, rather than actually cooling down the room. At some point I moved to sleep on the couch for a while, where temperatures were more bearable, but it's not really what I had in mind when we booked the airbnb. As having a comfortable place to sleep was our main requirement for the airbnb and we didn't have a great experience with that in our stay, it would be hard for us to recommend the place. If there was a way to control the heating of the apartment or if you are a very easy sleeper and really not sensitive to heat, then it can be quite a comfortable place and the location is really an amazing advantage.