We had a great stay at María's apartment. It's just a few blocks from Sagrada Familia, but on a quiet street. The apartment was clean and had everything we needed during our stay, and the balcony has a nice side view of Sagrada. Note that the second bedroom does not have any windows, so it can get a bit stuffy, but it has a ceiling fan so it was no problem.
María met us for check in and gave us some helpful tips for where to eat and sites to see in the area. We much appreciated the recommendations!