I had an awesome stay in Jose & Patricia's apartment! The place is pretty awesome with full kitchen, washer/dryer, 2BD/1BA, heating and A/C in every room.
In addition Jose provided a complimentary bottle of champagne and box of cookies. He was very friendly and was waiting outside the front when I arrived to show me around the apartment.
The only reason you might not want to rent the apartment is that it is not in central Barcelona, however it is 1 minutes walk to PERE IV green tram line, 8 minutes to Poble Nou metro, and accessible to CCIB within 11 minutes on public transit.
I had a wonderful stay here and would stay again!