J (the host) was very friendly and responded quickly to messages before our arrival.
The appartment itself is small but functional and corresponds to Barcelona Airbnb standards (although the bathroom could be a tad cleaner but this was due to the heavy usage, see below for details).
We were a little surprised to find out that another room in the apartment was being rented as this wasn't clear from the descriptions and the host didn't mention it at all.
What we really had a probem with, was the fact, that one day we woke up to find people sleeping on the couch in the living room, who obviously weren't Airbnb guests but friends of what appeared to be the hosts girflriend. They stayed for the rest of our stay, so including us and the person in the other rented room, plus the host and his girlfriend there were 7 People in total in the apartment.
The Bathroom was occupied all the time (some people obviously needed to shower twice a day which was very thoughtless considering the size of the bathroom and the number of people) as was the living room and the kitchen, so we basically could only stay in our room while there, which was ok since we came to see the city but the apartment felt really crowded, the bathroom is way too small for 5 people, not to mention for 7.
Additionally the 2 extra people who didn't rent a room were really noisy (coming home from parties at 3 in the morning and playing loud music).
We're usually not very picky and really had great experiences in Spain and especially in Barcelona with Airbnb. The Host was very friendly although he could have been clearer on the details and shouldn't pack 7 people into an apartment that is way too small for that.
We're sad to say that this was our worst Airbnb experince to date (and we've had quite a few).