Cristina's place is in the center of Lisbon, four min away from supermarkets and surrounded by bars and attractions.
The small apartment is very efficiently driven and set-up with the necessity amenities that you might ask for. It has a strong shower and offers space to cook, which was great for us as a family.
Noise levels are adequate, though it might be get louder at night time as the location is surrounded by bars....windows shut it is quite.
Overall a good place to spend your time in Lisbon.