I have stayed at The Royal Chulan many times. It's a fair hotel in a very nice and convenient area -- near Bayswater Station and Hyde Park. Hotel is no frills, but has a kitchenette. Most of the staff can be very nice.
Our recent stay was not good. We got a basement room, which you should avoid at all costs. Room was musty, as there is no ventilation. Sheets had holes and beds were not comfortable. Bathroom is fitted for handicap accessible needs, but all light sockets are overhead and a major fire hazard.p