I stayed in this apartment for a week with my wife, parents and two kids, and we loved it. Its location was very good, it is literally a few seconds from Harrods, and minutes away from all the museums in South Kensington. The area itself is very good, full of stores and good restaurants, where we could dine every night. However, the kitchen was very well equipped, so if you feel more like staying in and cooking you can do that too!
We particularly enjoyed the communication with Johan, he is a very kind and friendly person, and helped us with everything- from advice on how to get to the apartment when we checked in to tips on which bars or restaurants to choose.
All in all, we really enjoyed staying there and we are definitely going to call Johan again when we return to London!