Gen was very helpful with finding a good option for parking our car for the week, and was generally very quick to respond. We really enjoyed our stay.
The flat itself is very good as a base for exploring London, note that if you come with 5 or 6 people and the sofa in the living room is converted to a bed, then there is only the small kitchen as communal area, so you probably don't want to spend lots of time in the flat itself during the day; but this is not the point of coming to London in the first place I guess. Also, don't expect to do a lot of sophisticated cooking - if that is what you plan, maybe try finding a bigger place.
But if you just want a good value, conveniently located place to sleep, have breakfast in, and maybe cook some simple meals in the evening, then this is a very nice and good value option.