We really loved our stay! The apartment was quiet in spite of being near busy roads, and very convenient for anyone wanting to walk to Gaudi sites. It was a 15-20 min walk to both Casa Battlo and Sagrada Familia, and only a 10 min walk from several convenient metros. We even walked to Casa Vincens (40 min, a lovely stroll with shops and sights along the way) and to the Gothic Quarter (ditto). There were plenty of restaurants and grocery shops within a few blocks.
The apartment had everything we needed-- we even did some laundry and dried it on the rack provided. There was plenty of hot water for showers and the apartment heat was good (we were there in January). Wifi was strong and reliable. We felt very safe in the apartment and other residents were friendly! Recycling stations were right on the street downstairs.
We especially appreciated being able to check in early, and Miguel arranging a taxi pickup for us on the day we left.