Gregory's place is situated on a quiet residential street, which is nice, especially if you want to get away from the noise of the city after a long day.
The house was very clean and bed was very comfortable.
The place may not be in the downtown area, but is 5 minutes from the underground, and 10 minutes (via the Victoria Line; ~18 for the Piccadilly) to get to the downtown stations. Making it very close and easy to get downtown; so the area is not difficult at all.
Gregory was very helpful in giving suggestions and helpful hints about London, where to go and what to get and do. Also gave out several amazing restaurants around the town to try.
Overall, this was an amazing first experience to AirBnB, and Gregory helped make that possible.