The apartment is loyal to the picture, in a small alley facing an abandoned building, so it is pretty quiet. There were some loud neighbours arriving late at night but this is not the host's fault, really. The location is great. Close enough to Bairro Alto and all of the Old City but far enough you don't get crowds of people passing by it. The AC is only in the living room but the apartment is small enough that you can sleep with it on and it cools down the bedroom. Advisable for a couple or maybe 3 people with the third one sleeping in the living room. More than that would feel crowded. The flat was clean and Angelica came over the first morning to explain us some basics. The company's office is on the same street in case anything happens, which is very convenient. Overall a good experience.
p.s.: Lisbon has an issue with sewage, so sometimes drains exude a not-so-nice smell but it is not the apartment's fault.