On the whole, the flat was a very good home base with a superb location on a posh, relatively quiet street right next to Browns Hotel and around the corner from the Ritz. It was only a five minutes walk to Green Park and its very convenient tube station, or to Fortnum & Mason or to Sainsburys for staples, fifteen minutes to Soho and its theatres and hubbub, and ten minutes to St James Park. It was quite spacious with very generous storage; we were very pleasantly surprised that the front room was so quiet given that it faced on the street, and the bedroom which faced the court could not have been more peaceful. The washer-dryer worked well, as did the dish-washer. The temperature controls were easy to manage and the radiant floor in the bathroom was a welcome luxury. The flat was very well-lit (except for three nonworking overhead bulbs in the bathroom which need to be replaced). Even though the flat was only on the first floor, the elevator made dealing with all our luggage very easy.
Some nits, from minor to major: the kitchen was adequately outfitted with a large fridge, though a £5 corkscrew/bottle opener would have saved a lot of agita provoked by trying to use the medieval torture instrument provided. One very vexing kitchen issue was that it was impossible to toast bread even lightly in the provided toaster without setting off the shrieking fire alarm. The wifi always gave a signal, but was erratic; sometimes I had better luck turning it off and relying on my data plan to access the web. Our major complaint about the flat was the fact that there was not enough hot water provided for even one comfortable bath; two quick showers in succession exhausted the hot water supply. Our contact Ali sent over a maintenance man to deal with the hot water issue the same day we raised it; he improved it to the extent that we could shower, but was unable to do more. Since a bath tub was a selling point for our having chosen the flat, we were disappointed. In addition, the ironically ridiculously deep bath tub makes it quite difficult to get out of it after showering; my wife and I are both fit, but found it perilous. Less agile renters should beware!
I would rate the flat as very good rather than excellent for the reasons cited above. However, since the location is so outstanding and the overall standard very acceptable I would stay there again.