Although I mostly was outside, walking in the city, during the few days I spent in Lisbon, I also spoke with Mariana for a while. She is a very friendly person and staying at her place felt like staying at the family and not in a stranger's appartment. :)
The room is sunny, spacious and with a small balcony. It's just steps away from the metro and the tram 28E, and just 10 minutes walk from the best miraduro on this side of the river! (Miradouro da Senhora do Monte)
I totally recommend Mariana's place!