We had a lovely 3 night stay with our three year old. Marta, our host, was very responsive and helpful. The location of the apartment is perfect; in a fairly quite area within walking distance to grocery stores, lovely cafes and the metro and away from the hustle and bustle of most tourist spots. The apartment is in a beautiful building and is very clean, spacious, and sunny. We would love to visit Barcelona and stay here again!
Tip: For breakfast, skip the pretentiousness at Praktik bakery across the street and instead go to any of the charming little cafes on the other side of the building.