We had a great experience staying in Rosa's apartment. It was exactly as it is seen in the photos, and was clean, with everything supplied that you could possibly need. I met Rosa when we checked in and she was very welcoming and friendly, and very helpful in explaining how best to explore the city - a great host!!
The neighbourhood was great, it was quiet enough but also still in a very good position, with the beach and a metro station both a very easy walk away.
I definitely recommend Rosa's apartment, and would stay there again if I went back to Barcelona.