We stayed in Romina's apartment 1 week in the begining of april - two adults and 4.5 year kid. We have been nicely welcome by Romina and we got a lot of tips about city, restaurants etc. prepared for us. Romina was very responsive and she advice us about many things before we arrived to Barcelona. The apartment was great, very clean and tidy and everything works fine. We didn't had a car and it was so easy to take a metro (just 1 min walk).

Ps. Just remember that Barcelona is noisy city so expect that it would be a little bit noisy in the apartment as well due to traffic on the street.

We recommend to check "Ramen-ya Hiro" restaurant which is just 50m from the apartment (the best one in Barcelona):
http://pl.tripadvisor.com/Restaurant_Review-g187497-d3845663-Reviews-Ramen_ya_Hiro-Barcelona_Catalonia.html
It is very cool place with amazing food, worth to wait 30-50min in the queue to get place :)

We had a great time in Romina's place!