I spent just under a week in Ana's place. The apartment contained most of what you would need for a short stay in Lisbon. Although the area itself wasn't very lively but it was only a 15/20 minute walk to some really pretty streets in Alfama, as well as Baixa-Chiado where there is much more going on. The apartment is, however, very close to the famous and delicious Cervejaria Ramiro restaurant - it's only a 5 minute walk away. Ana was away during my stay but she checked-in to see how I was getting on which was nice. Catarina was tending to the flat whilst Ana was away and she very helpfully gave me a map of Lisbon with information on the key areas/sites to explore. the flat also had satellite TV which was a nice touch.
The walls in the flat are quite thin so it was possible to hear people walking around the flats above and having conversations outside the door at times. Also, because of the courtyard I could hear neighbours in the flats above or houses in the surrounding area playing music and having conversations on a few evenings. It wasn't overwhelming loud but just something to bear in mind if you are a light sleeper.