It can be one of the best experience I had since I use Airbnb.
Room very clean, even on the floor under the bed was almost no dust. The apartment was big enough for us three and we could find everything we need in the apartment. The host was very very very nice and helpful, gave us a lot of useful advices to let us explore the city better. He recommended us sightseeing places, restaurants and booked a taxi for us to get to the airport.
The checkin and checkout were very quick. Communication fast and informative.
The location of the apartment is not that central, but we could get to everywhere with metro conveniently.
I would recommend this apartment and this host to everyone who wants to visit Barcelona.