Our host Barbara met us at the apartment to give us a thorough walkthrough of the space and also some tips on local restaurants. I suggest downloading WhatsApp for communication here. The apartment had great amenities: AC units that kept the whole place cool when we were there, a TV with all the works, a washing machine (no dryer but clothes can be hang dried out the bedroom windows), and a spotless bathroom. The unit is located on the third floor but luckily there is an elevator in the building.
The apartment was spacious and located centrally to all the areas we were visiting. There is shopping a few blocks away and a ton of restaurants nearby. We didn't take public transportation during this stay but everywhere we went was just a short Cabify ride away.
We would recommend any visiting Barcelona to stay here.