I'm glad that I chose to stay at Carlos' place! I only stayed for 2 nights, but I could feel his hospitability by the amount of food/drinks he offered me. He also carried my luggage upstairs when I arrived, and after the checkout he let me keep the keys until it was time to go to the airport. That way, I could leave my luggage in the apartment in the morning, do some tourism, and go back at night to get my stuff, all without worrying whether he'd be at home to open the door for me.
The location is great! The street is very charming, with the architecture that is typical of Lisbon, and beginning my day walking down it put a smile on my face. The address is on a hill, which means that it's tough to carry heavy luggage from the subway station all the way up, but it does pay off when you see the view from the bedroom window. The sunrise from there is beautiful!