Just back from 4 nights at Oscars place. It was fabulous. We booked his car service and it was a life-saver as we arrived quite late and were exhausted. Only met Oscar briefly but he was really nice and informative.
The place is great, 5-7 min walk from Fontana metro and Joanic metro is half that distance. Safe neighborhood and I though very quiet. Everything was clean and working.
If I have to put a 'con' I guess the elevator is small (welcome to Europe), but much fast than anything I encountered in Italy.
Highly recommend this place. It's near everything but not right in the middle of it so you will get better food and cheaper prices for everything in the surrounding area than at the Ramblas tourist traps.