The 3 of us enjoyed staying at Susana's apartment for 6 nights. It's in a safe quiet neighbourhood but it is a little away from the main tourist spots. Once we learned that the bus routes are much better than walking 11 min to the metro it made things easier. Also, taxis are reasonably priced in Barcelona FYI.
The apartment is a little on the older side in terms of furnishings and style, and the cleanliness was average based on other air bnb's we stayed at. A reasonable choice for a family of 3 or 4 on a budget.