The apartment is ideal for four people, spaceful and well equipped, with two bedrooms and two bathrooms, a nice living room and kitchen. Graca neighborhood is beautiful, I loved it.
The only two considerations I leave for future guests:
1) you can park on the street in Graca. However, streets are very narrow and steep, and you have to search for a space. I was lucky I arrived on Christmas Eve, with little traffic and I found a space in front of the apartment.
2) if you visit Lisbon in winter, the apartment has only two portable heating radiators. We used them in the bedrooms but as we woke up, living room and kitchen were pretty cold.
In the bottom line, however, I would recommend Julia's apartment, and Lisbon is very beautiful. I really would like to come back.