I enjoyed the city and Joana's apartment is the perfect base with small parks, bakeries, coffee shops and good restaurants within walking distance. It is slightly away from the tourist areas of Lisbon, but I had chosen that consciously. There is a subway station a 10-minute walk away and from here you can easily travel around the city.
The apartment itself is on the ground floor and indeed you can hear the door slamming regularly in the morning and evening. I have been there for a month and have not experienced this as unpleasant. Furthermore, the apartment is equipped with the aforementioned conveniences. Two air conditions have also been installed, which are able to cool the space quickly.
Finally, I experienced the communication with Joana as pleasant. Although a message did not go through in the beginning, I received a response back within 3 hours (usually immediately) for the rest of the period.