Visited for a few nights with two other adults. The location is fairly central; easy access to public transit, the main shopping streets... there are many restaurant options nearby also. We had peaceful sleep and the balcony was delightful, though we didn't use it as it was colder.
We went all over the city of Barcelona with this place as our base and it was quite convenient. If you're bringing a car, the parking in the building is quite costly (charging by the minute...) and it doesn't look too easy to park on the streets. We biked around and found this place to be pretty accessible for that.
The apartment itself shows a bit of wear and tear, and the rooms and the building have an awful smell that is masked with perfume. We aired out the rooms every day which made it bearable. But, everything is usable, and served us well as we didn't stay in the apartment too much. For the amount we paid it was apt, and would return!