I spent a week in Barca together with my family at David's apartment. The apartmertment looks just like the pictures. It is very well located near two metro stations and there is a bus station very close to it so one can quickly and easily reach any point in town. The neighbourhood is very nice and quiet. There are many bakeries and supermarkets in the area, where everything is fresh and delicious.
I had contact with both David and his wife Laura. I can say that they are really nice and hospital people. They live nearby and came to us any time we needed them. I would totally recommend this apartment and hosts to everyone who wants to go to Barcelona.