Lovely and spotless apartment! We stayed there for 4 nights and the apartment perfectly matched our expectations. It is not too big but it is very comfortable and very well equipped (photos are very realistic). It has everything that you'll need to cook and to prepare the breakfast (only a dishwasher is missing but it was not a problem for us).
We believe that it's ideal for 4 persons but it can accommodate 5.
You'll find grocery stores, bakeries, pharmacies and restaurants nearby. We found the neighborhood calm and secure. Collblanc metro station is a 5 minute walk down the street which was perfect for us to explore the city.
Marta is a great host and promptly provided all the information that we needed and she also gave us some tips of special events that were occurring in the city. Summing up, highly recommended place to stay in Bcn!