This apartment was nearly perfect for our family of 4. The best aspects were the location, first level, terrace, large windows for air circulation, and the restaurant downstairs (Los Dos Pescados). The check-in process was on time, but should have been more thorough. The communication was good via text, but not in person. This is good for anyone, but better for an experienced traveler and Airbnb user.
Good things to consider: close proximity cafe, gelato, restaurants, park, ATM, metro, and Barrio Alto without all the noise and commotion. Compared to Barrio Alto, this street is very quiet and peaceful. Use Uber or Metro for this apartment, no rental car. I would not stay in Barrio Alto after seeing what goes on there unless I was 20 something, single, and wanted to party until 6am.
Warnings to consider: (1) Parking is nearly impossible, so I would advise against renting a car with this apartment. I got a 129 euro fine for parking on street, which could have been much more had I not caught it early to avoid a tow/impound. *Not an issue if you Uber or use metro. (2) Need to be fairly independent and experienced traveler to stay here with respect to orientation of the apartment and getting basic supplies needed for your stay (trash bags, dish soap, and laundry detergent). Not a big deal, but could have been mitigated knowing in advance.
I would recommend overall with the considerations listed.