I personally always prefer staying away from notorious touristic routes closer to ordinary habitants. In those terms the flat is absolutely perfect. The hood is quite and calm, a bit away from all this big city vibe, even taking in consideration that commuting transport (metro, bus) is just round the corner and Barcelona Sants railway is around 6-7 minutes walk (another advantage for us, as we were traveling around Spain by ground).
The flat itself is clean and well equiped, check in was comprehensive and host are very helpful! The only thing is the environment in the flat was rather chilly, but basically there's nothing to do with the place: we stayed in Barcelona in the very end of January, precisely one of, I guess, two month with low night temperatures :) People here just don't need central heating or heated floors for living, and the AC is obviously not enough for night temperatures. However the bedroom blanket was a saviour so we stayed warm during sleep