I was in July 2014 with a friend (both 24) for one week in the appartment of Andrea and Yanet. Just in short the major bullet points:

+ the couple is amazingly friendly
+ the location is incredibly perfect. 2 large supermarkets (50 meters away), many bars and restaurants everywhere, 4 minutes walks to the beach, even the major discos are just a few minutes on foot away, metro and bus stops are also only around 3 minutes away
+ the whole appartment is totally clean and they even cleaned our room, got waste from the bin etc.
+ we could use the kitchen as it was our own home. They had all the things we needed for cooking.
+ although it was very hot in Barcelona the room was due to the window and the shade in the street during the nights quite cool. So one can sleep very good.
+ no matter what kind of question you have to Andrea and Yanet, they always help as good as they can. No travel guide could do it better.
+ The street they are living in is calm and all the people living around have been very friendly.

Thanks for the great time in Barcelona!