I totally recommend Rasmus's apartment in Gracia! The place is just as announced (very clean and comfortable), in a great location near public transportation and near restaurants, pubs and coffee houses.
I spent two months living with Rasmus, and he was very friendly and helpful when needed. When I just arrived he showed me the neighborhood, and provided me with useful information about the city, apps to travel and to enjoy my free time in Barcelona. We also went out sometimes and had a great time!
Advice: there is no elevator in the building, so the stairs sometimes are a little annoying, but you get used to them and to the exercise.