I don't know if you could have a better host than Andre! He went above and beyond to make sure that we had a great stay. He was extremely communicative before our trip, answering any and all questions, and he sent me a text every day during our stay asking if there was anything we needed. He was super accomodating as well, allowing us to check in super late at night, leave our stuff in the apartment after we had checked out because our flight wasn't leaving until the evening. He spent time chatting with us too and is very kind. We also met his roommate Ludo who is a chef and very polite. There were some other travelers staying at the apartment but we saw them only once when we arrived, and never saw or heard them the rest of the visit.
I really liked the neighborhood. The 3 closest restaurants are some of the highest rated ones on tripadvisor. Try the bunch place to the eat, French hamburgers to the west, and gelato across the street. There is a bar that opens across the street that is very noisy literally all night long, but I put white noise on my phone and slept through it. My husband had no problem sleeping through it at all. It is about 3-4 min walk to the metro, and super close to plaça catalunya, les rambles, and Casa battlo. We were out at every hour of the night and never felt unsafe in the neighborhood.
The apartment was as he said, were in Andre's room, and he stayed with a friend. The only thing is that the bathroom is down the hall, not in the room. There are a LOT of stairs to get up to the apartment, so do some leg workouts before you come! ;)