My family and I stayed at Maria's lovely 3 bedroom 2bath apt. The bathrooms, kitchen, dining and outdoor terrace were our favorite part of our stay there.
The location worked fairly well for us; we enjoyed walking and did so frequently to La Rambla (took about 20mins) and old town area. The metro was easy to catch from this location as well.
If you are sensitive to sounds; you may wish to bring ear plugs as there are children in apt. above.
Maria likes to leave the apt. scented with air fresheners; if that's a consideration you may wish to ask her to put them aside for your stay. ( we were sensitive and put them on the patio: an easy fix to a minor problem).
All in all a lovely stay and a great apt for the cost.