Because I always book airbnbs myself based on other's reviews, I am sharing my experience, hoping it will help you making a choice as well:

My boyfriend and I had a wonderful experience staying with Robert. I have stayed in Airbnb listings before, but this one was definately one of the nicest. Robert was a wonderful host, he is very helpful. The apartment is beautiful and clean, and just 5 minutes walking from Portobello rd. where all the nice restaurants and bars are located. The area is safe, it is located in Notting Hill and public transport is convenient. Most of the time we walked 20 minutes to Notting Hill Gate (Central Line, Tube) or we hired a bicycle but there is also a busstop next to the apartment. I would definately recommend this apartment.