Our stay was perfect.
The neighborhood is vibrant, full of shops, bars, cafes, and restaurants but still quiet and relaxing and with that magic scent of Barcelona. Also quite close to the metro station and important bus stops.
The apartment is very clean, spacious, and well equipped. The bathroom is maybe a bit small but no big deal.
We had no problems during our stay besides that we locked ourselves outside one day when we went to the groceries store and left the keys at home. Of course our fault. We simply had to contact Klaus and wait some time for him to bring other keys.
Klaus is very attentive and easy to communicate with. He waited for our arrival downstairs and prepared the apartment with some snacks, fruits, soda, and beer.
Overall, a very nice place to stay. We highly recommend it.