This apartment is in a good location if you want to experience the night life of Bairro Alto, without worrying about the street noise, because it's literally under the roof on a 4th floor in an old building (narrow/funny wooden staircase!) and the street is far enough from all the mess. I was happy to stay there after a 3min walk from partying in Bairro Alto.
It's very close to a famous viewpoint and Elevador da Glória (one "tram" that goes up & down the steep hill) is 1min walking from the building, giving easy access to Restauradores/Rossio squares.
I am from Lisbon so I did not need directions or tips, but Teresa's friend who opened the doors for me was at my disposal had I needed some help.
The apartment had everything I needed, including hair dryer and wireless Internet. Obrigado Teresa!