Great place right in the city centre, not the quiet neighborhood but it is the city centre with lots of nightlife so it's not to be expected (just be aware if you are traveling with babies or if you're a super light sleeper).
Very clean, very responsive host (gave us great info about the city), easy to reach from the airport (by bus or if you're a larger group by taxi), few steps from different metro and bus stations with direct lines to Sagrada, Camp Nou, etc., few steps from La Rambla, close to the beach as well if you fancy a short walk.
Definitely recommended.