Location: I needed to stay in Barcelona with 2 friends for the Grand Prix in Montmelo, a town to the north. The apartment is perfectly situated, being 5 minutes from a train station that has regular trains to the circuit and to the airport. It's also close to the city centre - a half hour walk or short metro ride. Plenty of eating places and bars nearby too.
Apartment: Clean and well-furnished. We had 2 in the double room and one on the mezzanine. The double room is small but was fine for our needs. The mezzanine only has a curtain so it can be a little noisy, especially if there are guests in the triple room at the end of the corridor. There was a private bathroom, just for our use, which has a great shower.
Host: Guillaume is a great host. He was always contactable (despite being busy) and replied to our updates/queries promptly. He was very understanding when we arrived late due to flight delays. He also helped out with booking early morning taxis when we were due to leave.
Overall: A great experience, would recommend.