The apartment is beautiful and just as described. We didn't have any issues while there. Everything was in working order and the apartment had everything that we needed while we were there. We loved using the outdoor space. One of our favorite meals while we were there was just downstairs from the apartment in the Colombian restaurant next to the building. It is a must try!
The apartment is within a few blocks from multiple subway stops, however we mostly used cabs since there were a few of us and they are pretty inexpensive. The best place to get cabs is one block south on Carrer d'Arago, which took us a few days to realize. The most convenient grocery store is Mercadona, which is two blocks east and half a block south from the apartment.
If you are sensitive to noise, the front bedroom might not be a good fit for you. With earplugs you can't hear a thing though. It wasn't a problem for us.