I stayed at Pedro's place for one night and left Lisbon wishing I had stayed there for all the days we spent in the city. The apartment is in the heart of the city and literally less than a block away from the park where many free walking tours start. It's also really close to the metro and a stop for tram 28 (if you're feeling touristy). Coming here from the airport was as simple and cheap as a metro ticket. The space is on the 4th floor and there is no elevator, but it lends a beautiful view of the surrounding streets and is delightfully quieter than being on a lower floor. It is a little warm during the day since it is the attic space, but there is a fan in the room and overall temperatures in Lisbon cool off considerably at night. Plus, who spends all day in the room when you're on vacation?
Overall, I loved this building. Yes- you will have to take the stairs each time you return, but I really didn't mind because there is a lot to admire about the wide staircase and age of the building in general. Pedro can tell you how old it is and he can also speak incredibly fluent English!