I have stayed one week at Nuno's place. I have loved it. The appartement is small but well created. The decoration is very nice and the view amazing : Castelo on the right and Miradouro da Graça up on the hill where all the restaurants are. There is also some very good Portuguese restaurant around the appartement.
The kitchen is well equipped and charming as the big bathroom equipped with a bathtub. The view is beautiful also on the city.
The bed is very comfortable.
I recommend 100% this place close to tram 28, Alfama, Castelo, métro station. All that is practical to spend an unforgettable stay in Lisbon.