We loved our stay at Carlos' place. He was very accommodating, gave us lots of recommendations and tips, and seemed to genuinely care about making sure we were fully aware of great and unique things to enjoy while in Barcelona. Wifi was great, the location made it easy to access everything via Metro, plenty of groceries were nearby, the flat was quiet, shower was hot, and Carlos was kind and open to sharing and chatting--what more do you want? Overall, highly recommended. Carlos is a great person, and his home is a great place to base your explorations from.