The apartment is just next to the metro station Placa des Sants, when we got there earlier than usual check-in time, Maria's brother Kiki was very kind to receive us explaining about the flat and nearby the area. The flat was clean with rooms tidily kept, and a cozy living room though not very spacious. It also have a small balcony with a pleasant view.
We had an unfortunate event that the wifi all of sudden didn't work after our first night. We had to wait about 2 or 3 days to have a limited access but eventually Maria sorted out to make it work. At some point it was a bit frustrating partly because we had to communicate in Spanish, but looking back I am glad all went well.
Barcelona is a great city to have fun, and because the metro station is just in front of the apartment, it was a great advantage. A nice neighborhood as well, we particularly liked the market which Kiki showed us for the first time.