We had a very pleasant stay at Jorge's flat. The place is central, clean, well equipped with a nice view from the balcony. Jorge was very friendly and flexible and went out of his way to make our stay comfortable. He is very knowleadgable in portugal history and had a lot of useful tips and recommendations about lisbon that he gladly shared with us.
Ps: he's name is Jorge and he really is a marine biologist: https://youtu.be/Oy5m4m8GayQ