You were looking for a 4 star hotel in London in a tourist area that was reasonable. A tall order! I cannot recommend any that meet your criteria based on my own experience because I tend to stay in a 2 star hotel when I visit London.

But my friend has recommended The Abbey Court Hotel at 20 Pembridge Gardens in Notting Hill Gate near Kensington Gardens. Double rooms start at 135 pounds/night which seems to be good value for a 4 star hotel. http://www.abbeycourthotel.co.uk/gb-index.html

You also might look into Durrants Hotel on George Street adjacent to the Wallace Collection, in Manchester Square - http://www.durrantshotel.co.uk/index.html

Have a great trip!

Mark Los Angeles