I had the pleasure of staying at Casa Chelsea for 4 nights during my recent trip to London. The flat is immaculate, well decorated and has all the amenities you will need. More importantly Wills truly is the host with the most and went above and beyond to make sure everything was taken care of during my stay. Highly recommend, especially if you are looking for a charming real London (ie not in the heart of the tourist district though still convenient access to all).