Carla has a very nice apartment with two rooms located in the very centre of old Lisbon close to the Cathedral, castle and some amazing viewpoints. It has everything you need for a week stay including the stuff for cooking. The check-in process is easy and smooth.
Carla is very supportive. We had a problem during our stay, and she reacted very fast and did everything she could to help us.
The only thing you should keep in mind is that the house is placed uphill and the apartment is on the second floor with no lift. It wasn't a problem for us but it's good to know this in advance.