The apartment was very clean, and very comfortable. We did not know when we booked, but apparently we were the lucky first guests after it was renovated--and the renovations really showed. The apartment was sleek and modern, and although it is a studio, the new fixtures made the most of the available space, and so we never felt cramped. Additionally, it had great amenities (like a washer/dryer and cable TV).
Though not totally centrally-located in London, it was still in an excellent location. Several museums were a very short walk away, and Buckingham Palace and Hyde Park were also very close by. Additionally, it was only a few minute walk to a tube station, so travelling around the rest of the city was very easy. There were also plenty of pubs and restaurants close-by, so we did not need to walk far to get good food. Also, the small grocery store on the next block over made things very convenient.
Ana was great communicating with us about the apartment, and we had no problems checking-in or -out.
We have no complaints whatsoever, and would absolutely consider staying at Chelsea Cloisters in the future.