Mattia's place is in a very nice and quiet neighborhood (Pimlico). It's just a short tube ride away from all the highlights and one of the main Underground/train stations in London (Victoria Station). The host picked us up personally and showed us around. The apartment was very clean and had a few nice details such as a welcome letter and some basic things in the kitchen like coffee, tea and butter. The furniture was simple but fine. The place was a little bit small, but if you're on a nice citytrip you'll only be on the room to sleep. So that was okay. It even had a nice view on the Big Ben and the big towers of the city center. Note that the place may not be suitable for people who are less mobile as it is on the 4th floor with no elevator. I will certainly visit again!