We recently stayed at Nuno's apartment in Alfama for a long-term stay of two months. The apartment was as described and depicted in the pictures (the apartment is indeed very sunny and cozy).
The location of the apartment was in the heart of Alfama, one of the oldest neighborhoods in Lisbon. It was within walking distance to some of the city's top attractions.
Nuno was a good host. Marieta, who manages the apartment for Nuno, was responsive to any questions we had and provided us with a lot of recommendations for things to do and places to eat in the area. Whenever we faced a problem, Nuno and Marieta were always there with a solution.
Overall, we recommend Nuno's apartment for anyone looking to stay in Lisbon. It's a convenient and charming location.