My boyfriend and I stayed in this lovely little apartment for a week, and we loved it. It had everything we needed for a comfortable stay. We called the number we had been given when we were on our way to the apartment, and were met by someone to give us keys and explain rules etc. we were left to our own devices completely, which we liked but if you're looking for a more guided stay it might not be for you! The place was clean, well equipped and the balconies were a real bonus.
The location was great, about 25mins from the centre of Barcelona. Gracia itself is buzzing, we loved it! We had everything we needed within 5/10mins of the apartment, including great tapas, local food shops and communal social squares.
We have already decided we will be back to stay here!