The location of the apartment was very good, only a few minutes to walk from Avenida metro and with lots of cheap eating locations around the corner. I recommend Senhor Lisboa at the corner of the street for a good quality meal (make sure to make a reservation!).
The apartment was a good size for the two of us, but I wouldn't want to stay there with 5 people. There is only 1 couch and it's a bit old/uncomfortable. The bathroom is small, but the shower was excellent.
Since it's an old building, it was a bit noisy. The neighbours are also an Airbnb and those who were staying there now, were quite loud. You could hear noises as if they come from inside the apartment.
I went on this trip with my mom, who is old and has difficulty walking. She didn't appreciate the (steep but short) hill she had to walk up to the apartment. If you're in fairly good condition, this won't be any problem for you though. After the first day, we decided to take Ubers everywhere, which worked really well for us and I totally recommend it.