What a nice experience to be hosted by Natércia. The appartment is clean and in a nice neighbourhood and could even be at an average walking distance if you don't mind this activity (20mins from Rossio). The metro station is 3mins away to go wherever you need or even better, 2.5 euros with uber to get to Rossio. The location is just very good!
When at the house, Natércia asked which type of experience we were looking for: feel like in a hotel with an everyday cleaning, making up the beds, cleaning out the carbage...etc, or a more independent life where she'd only show up for the checking out. She was glad to propose this to us and more than what she said, we would find local sweets at home (pastel de nata, chocolate cake, almonds sweets, fruits, Port wine)
Natércia is helpful and gave us advice about what to visit in Lisboa and Sintra. We also found city plans and other tourist information on our desk the first day.
I highly recommande Natércia. Chose the first option so you can get to know her a bit. Very love person indeed.