One of the best things I did when planing my trip to lisbon was staying at gonçalos's apartment. The apartment is just beautiful and impeccably clean and tidy. It's in the middle of everything and steps away from amazing restaurants and bars. He was very quick to respond via email and to any questions and that made me very secure when I was looking for a place to stay in Lisbon. The only complain I have is that I had to leave ( lol). I know you are going to love this apartment and Barrio Alto. Oh and don't forget to go to a bar called PARK in the rooftop of a parking lot with spectacular view of the city and really cool people.
Thank you so much Gonçalo. You are the best!