The apartment is great and Daniela is the perfect host!
The apartment is located in the famous bars neighborhood, and very close to other parts in Lisbon's center (3-15 minutes walk to most places). Bairro Alto is full of night out places but when you close the window you hear nothing from the street. The apartment was clean and the kitchen well equipped.
Furthermore, Daniela sent us a list of great recommendations for the city, and helped me in the middle of the night when I got stuck outside of the apartment because my sister left me without the keys! In general she was super responsive and informative.