Very good location, very nice apartment. Everything was perfectly clean and João ist very nice and helpful. The only thing to notice would be that there is only one bathroom for a few separate rooms and that lead to some waiting time sometimes. It looked like it was cleaned every day though and living with roommates one also has to share a bathroom, so no problem. Just might be good to know.
Definitely recommended and perfect for young adults who want to live right in the center of Lisbon.