Overall, I enjoyed my stay in this charming and comfortable apartment. I would recommend it to a friend.
Pros: Claudia was responsive to messages. The apartment was as described and is in a good walkable location over a busy pedestrian street. It was quiet during the day. I was there alone, but I think it could accommodate the maximum number of 4 guests comfortably. Hot shower felt good after a long day of walking and being close to the Baixi-Chiado metro stop was convenient.
Cons: Not all amenities were as described: TV didn't work, apartment is not heated (1 space heater is not heating), not enough toilet paper for stay, no hair drier, no coffee maker. It can be noisy in the evenings with the dinner crowds in the street, restaurant activity in the stairwell, and late night garbage trucks.