I can't speak highly enough about this Airbnb stay!
it's a solid 10 minute walk from the Hammersmith Underground station, which means that it's close enough to be very convenient to get around London on the tube or busses and yet far enough away to avoid all of the noise around central Hammersmith.
There's a bodega just downstairs, a lovely coffeeshop right across the street and a fantastic Local pub (the Andover Arms) just a block away.
For a trip to London where you can avoid feeling like a tourist and really get a feeling of the city, I can't think of a better opportunity than staying at Mark's flat.
If/when I return to London, I pray that I'll be able to return to Mark's place!