Oliver is an awesome host - very friendly and he gave very good information on the area and things to see and do. His English is excellent!
The apartment was very clean and well laid out, except that the back bedroom isn't air conditioned so we weren't able to use it when we were there (temps were in the high 30's). The kitchen has everything you need but check that there's toilet paper as Oliver doesn't supply that.
The location was excellent - quiet neighbourhood with lots of grocery stores, bars and pastry shops nearby. Minutes walk to the Sagrada Familia (amazing!), and walkable to Ramblas and the Born and Gothic quarters (a cab ride back is around 5 euros).
Highly recommended!