My three friends and I stayed in Maria's apartment for a week in September. The apartment was clean and well equipped. The best part was the central location within walking distance of everywhere we wanted to go. Although it was a bit noisy at night, the location was well worth it. The rooftop terrace was great with a beautiful view of the cathedral tower.
We had a problem finding the apartment as the street is marked Calle Conteros on one end and Franco on the other. We were on the Franco end and although we wandered part of the way down that street and actually passed the apartment twice, there was no one out looking for us. Communication on the phone with Maria was difficult as we don't speak Spanish.
In spite of a stressful time getting there, we had a very enjoyable stay.