The apartment is located in Bairro Alto, a short walk from the Baixa-Chiado metro station. This makes it close to everything you could need or want, either by walking distance (restaurants, markets, bars, etc.) or by metro (everything else in Lisbon). Although Bairro Alto can be loud and crowded in the evenings, the apartment is well-insulated from sound by its height and interior doors.
The apartment itself is well-outfitted, including a comfortable living room, dining room, and full kitchen. Bonus points for the gas range! The bedroom includes a small balcony overlooking the back alleyway, which is great for both getting some air and enjoying Bairro Alto sans crowds.
A great stay! I strongly recommend Silvia's place.