We were traveling with our 18 month old and stayed at the apartment for 2 weeks. This was the absolute perfect location for us. It is a safe residential area and has all the shopping and restaurants you need right downstairs. The big bonus was there are safe places for our little one to run around.
It is a 5 minute walk to the beach and a 10 minute walk to the metro. It's about a 40 minute walk to La Sagrada Familia. On the way there is a fantastic park with a giant slide, parc infantil Glories.
The apartment itself was clean and well equipped. We literally had no complaints. The managing office is right down the street and were very kind when we had a miscommunication about checking in early and also booked us a taxi back to the airport. I'm already recommending to friends.