Carla is a great host, she was very helpful to my wife and I when we arrived with my daughter. She provided a cot and some toys for my daughter. She provided a map with directions to all the localities. The apartment is in an old building but is modernly renovated.
The location is right next to the Bairo Alto region which is full of great small bars and restaurants. It is close to two train stations and has the number 28 tram a minutes walk away.
It is about a 10-15 walk to the main Baxio/Chiado areas and less to the promenade. We really enjoyed our stay and would recommend the apartment.