The apartment locates in a quiet residential area but sometimes there were noises from the cars passing-by which were absolutely acceptable for me and my friends.
Parc Guell is within walkable distance (going up the hill) but we chose to take the bus 116 which stops just immediate right opposite Rafael's apartment and in front of Parc Guell. We then had a leisure walk down the hill on our return.
There was all we needed in the apartment and we enjoyed our stay a lot.