We stayed for a week in mid-July at this Chelsea flat and were quite pleased. The neighborhood is very nice and very comfortable. I was actually pretty shocked how peaceful and quiet it was - at all hours of the day and night. Our kids really enjoyed staying in an actual London flat (vs. having reserved a hotel room), as it made for a much more meaningful/authentic experience. William and the London Residents Club company were very communicative throughout the stay and very attentive to our needs.
Just a couple of things to consider with this flat, however. First, while the neighborhood is terrific and it’s very close to both Kings Road and Fulham Road (with tons of shops/restaurants along each), it’s not very handy to a tube (subway) station. The closest stations are 15 to 20 minute walks away (or 10 to w20 minute bus rides, depending on traffic), so if you’re opposed to either walking a lot or taking lots of cabs/Uber’s, this may not be the place for you. Also, if you come in the middle of a July heat wave (as we did), note that there is no A/C. That’s not unusual in London, but something to consider. It always cooled down nice at night and we had no trouble sleeping or getting ready in the morning. However, it can get abit muggy in the afternoon.
Other than that, it’s an extremely cozy and comfortable flat in a terrific neighborhood. Highly recommend it!