If you are familiar with the area, you can stop reading and go back and book the flat if it is available. It's exactly as advertised.
If you are not familiar with the area, or have never been to London -- this is the place you need to be. It's one block (about 300m) south of King's Road, on a nearly traffic-free residential street. No sirens, no road noise. You can walk up and down King's Road for anything you could possibly want -- one small Tesco is literally around the corner, and there is a large M+S as soon as you get to King's Road. Three great pubs within a 4 minute walk of the front door.
The flat is immaculate, and plenty of room for our family. We cooked a large Christmas dinner in the fully equipped kitchen, and the common area allowed plenty of space to spread out after the day's adventures. The spare bathroom on the first floor came in very handy in the mornings, and the small office space in the loft was immediately claimed by our teenage son and his laptop.