Oswaldo's place was just as described and left us nothing more to wish for. Clean, nice and spacious. It's located in a calm but central area, very close to the subway (Universitat). Restaurants and cafés around the corner and a 10-15 minute walk to the most central parts of the city. Perfect!
Oswaldo is a great guy, very professional and service minded. I will definitely try to get this place next time I'm in Barcelona!