This place is wonderful! I highly recommend it.
1)The location is perfect (~1 block from La Pedrera and ~5 blocks from Sagrada Familia). It is easy to walk to all of the major sights and the other neighborhoods.
2)Xavi and Marta are great hosts. They will help you with anything you need! They even agreed to keep my luggage in their warehouse while I travel around the rest of Europe.
3)The balcony is an nice place for a morning coffee or evening meal equipped with a table and two chairs.
4)The apartment was very clean and stylish.
5)The couch is long enough to sleep a third person of medium size.
Thank you Marta and Xavi! :)