We enjoyed our wonderful stay in Lisbon at Susana's place. While staying inside the castle walls is a great experience, one small downside to this is that you have to walk up the hill multiple times each day. A big plus side of the apartment is the double layered glass in the windows. This allows for very silent nights, and effectively shuts out the noise of the streets.
We would like to reccomend Susana's place to anyone who whishes to experience Lisbon from the heart of the city!