I just spent a wonderful 3 days staying at Annabelle's house with my two children. It was exactly as advertised, very clean and quiet. The location is absolutely superb. A few minutes walk to Sloane Square tube station in one direction, and Knightsbridge / Hyde Park the other direction. Despite being so central, the house is on a very quiet street, so there is no noise. The roof top deck is also a great place to work or hang out. A great base for a stay in London.