Diego's apartment is the perfect place to visit Barcelona. With it's old-wooden-styled furniture it's a nice place to calm down after a long day. And the location is gorgeous. You can reach some of the "must have seen" attractions by foot although the neighbourhood is not very touristy. There are a lot of tapas bars nearby, visited mainly by locals.
Additional to that Diego is a perfect host. He was very helpful with good recommendations and he has gone great lengths to make everything possible for us.