We had a great stay at Catarina & António's place! The interior was clean, well decorated, and cozy, and the location was ideal for exploring the different parts of Lisbon. Our hosts were also very helpful in providing suggestions on what to do in Lisbon and how to get around. They were also accommodating to our travel times. There is indeed a view of the castle, though it's a bit obscured by the nearby homes (not an issue for us; the pro's far outweighed this minor con). Overall, we enjoyed our stay very much and would recommend it!