I stayed there two days after a business trip. The circumstances made that meeting for the check-in was not possible but Sofia told me well in advance in order to find a solution and has been very friendly, open and flexible at this.
The apartment was very clean (including the kitchen that I did not use), very well situated to explore Lisbon's city center (close to the metro, train station, and also Easy to go to Rossio, Rato, Bairro Alto, Arroios, Alfanar, etc for those liking to walk). The neighbourhood is very safe and quiet at night. It has good WiFi and câble TV. I arrived after three days of rain (bad luck) so the air in the house was a bit humid but this is certainly not an issue when you spend the day outside like me (note that this is very often the case for houses in Portugal, even modern ones). My clothes and the bed stayed dry so it was probably more a feeling than what you may experience in some tropical countries!
For what I am concerned, the house was comfortable and an excellent value for money. And would stay there again if I had to go back to Lisbon.