Flat is good. District where flat was located is not amazing, because there is nothing interesting around. Flat is nice, clean.
On check out we had a problem with a host. Monserrat was demanding a city tax what was fair enough to do, though she wanted cash on hand without providing any receipts. Our concern was that we paying extra money to a host and not sure she would pay tax for us., rather take extra money for herself. This was a big and only negativity about our stay in Barcelona.