I stayed for 4 night at Maria's apartment.
It was such a clean apartment and my family were happy to stay there.
The apartment is located in Catalonia Square which means I was able to do everything in Barcelona, i.e, Shopping, sight seeing with public transportation and tourist bus even I walked to a beach called Nova Icaria. All information is from Maria actually.
I've not met her as she was so busy during summer but her mother explained everything what I need at the apartment.
No more explanation is required. I would also stay at this apartment if I visit Barcelona again.