Staying at Nuno's apartment was a great choice. Though small, it is perfect for two people. It is a very good base for exploring Lissabon - close to most tourist points but in a quiet neighbourhood. We explored most of the city on foot, but there are two tram stations nearby (one of them being the famous route 28) should you prefer taking the public transportation.
The flat was very clean, kitchen had everything one needed (including a french press, hurray!) and Nuno was always fast in replying.

Thank you for everything, Nuno!