Very good apartment, very spacious rooms and large lounge/dining area compared to others.
Well stocked kitchen and very comfy beds.
The only downsides are that the power shuts off whenever someone opens the main door which makes it difficult for some people to leave if others are asleep as the power and Aircon turns off.
There are also noise rules which day no parties (expected) but also no loud talking to laughing after 10pm which is very early, but Barcelona has a lot of Airbnb problems so this may be a city-wide rule. We were up till late and didn't have any complaints however.
The flat is very good value, good location for the gothic quarter and la Sagrada familia and about a 30 min walk to the beach! Would recommend for a group holiday.