We stayed in the apartment with my adult daughters and it was a good size place for us. Nice and spacious. Beds were very comfortable and the apartment had been finished fairly recently so it looked new and modern. Also, the location was excellent as it is easy to access from Heathrow airport and also to move around in London by tube. David and his wife were very friendly and helpful with everything.
The stairs leading to the apartment are fairly steep and narrow so that's good to know if you have any challenges with mobility.