This is a simple review: the 5 stars that everyone leaves makes total justice to this place.
It's very comfortable, and bigger than it seems from the pictures. Location is quite convenient for LHR and central London, since it's served by both the Piccadilly (Barron's Court) and District (West Kensington) lines.
Impeccably clean, with a good shower, fully equipped kitchen, smart TV and fast internet. This is as good as it gets for a London Airbnb.