Me and my friend have just returned from a great vacation in Barcelona. We decided to try airbnb and had a pleasent experience with Maria and Kike's place. The apartment isn't exactly in the centre, but is about as close as it gets- beautiful area, very well served by public traffic including a night bus that will get you straight to the airport (The airport itself is very close). We had a late night check-in and Kike kindly waited for us, gave us a map with instructions on how to navigate the city and even a transport ticket as we were clueless. He offered to show us the area, though we opted out because we were beat.
The apartment itself is very spaceous. If I had to complain I would say the furniture in the bedrooms was a little dated, but other than that everything was perfect: the bathroom was new, there is a really nice balcony and the apartment has every single amenity one could ask for comfort. Kike and Maria were very kind people to let us in their home and very thoughtful hosts.