My boyfriend and I stayed in Montse's apartment for four nights in the end of September. Montse responded promptly to all our queries which made the whole process easy and stress free. On the day of our arrival Montse was waiting for us in the apartment, she suggested a few good restaurants and given general tips and advises about navigating around Barcelona which were very useful.
The apartment was clean very bright and equip with everything you would possibly need for your stay. Oh and the terrace is gorgeous with amazing views . The flat is perfectly situated only a few minutes walk to Sagrada Familia. There are two metro stations in short walking distance and a nice supermarket across the road, a fresh fish and sea food counter just next door and loads of fresh fruit and veggies shops nearby. I would highly recommend this apartment.