Highly recommend this apartment. I would stay here again. Great location (15 mins walk to Sagrada familia, 10 mins to Casa Batlo, 25 min to go Gothic quarter). This is in a quieter residential area so it is perfect for a family.
A minor note: it is near the metro line so there is an occasional light rumble during metro operating hours. It did not bother me one bit as I am out most of the day but just an FYI.