I stayed at Joana's place for a little more than a month and I was happy with my choice to say the least. It has probably the best location in Lisbon, extremely close to my favorite places to eat and there's an amazing viewpoint just around the corner!
You might hear noise from neighbours from time to time (because like most of the building in Lisbon it's pretty old), but it didn't really bother me since it was in the afternoon.
Carlos helped me with late check-in (it was really nice) and always was available for me if I had any questions.
I highly recommend this place especially if you visit the city for the first time!