I had an excellent stay at Nell Gwynn House. The service was impeccable, from the porters to the Nell Gwynn managers. Very clean, cozy room with all that I needed for my temporary accomodation in London. The location is also amazing - right next to King's Road and all the shops and restaurants it has to offer; also very close to South Kensington tube station, which is very well connected to the rest of the city. All in all, a wonderful experience.