We've stayed a couple of nights with our 5 yo daughter. The appartement is within a 10 minutes walking distance (with our daughter) of the underground, restaurants and supermarkets. Also a park nearby with a playground! Love the location.
If your used to Londen hotels then you'll be surpised by the space you get. The master bedroom is fine and Steve also cleaned out a closet for us. The other room is pretty cool, although its really a boy's style room ofcourse. Our daughter loved all the games in the house to play in the morning before we left.
Downstairs you have a nice sitting area with a table in the fairly big kitchen! The only downside was the only toilet was upstairs in the bathroom (next to the bedroom were our daugther sleeps). We're normally used to having 2 toilets ;).