Great location. In the middle of Bairro Alto and Lisbon. Metro nearby, so everything is quite easy to get to. Street can get loud, but the windows isolate the noise very well! However, if you like to sleep with open windows for a fresh air - this place is not for you. There is only 1 toilet/shower, so consider that if you are a group of 3-4 people. Out of 3 sleeping rooms only 1 room had a proper wardrobe and a working table for the laptop. Behind one of the walls of the appartment there is a staircase for other appartments, but we rarely heard any movement there. Probably not so many people live in the house.
Overall - totally recommended if you are looking for a place to stay in central Lisbon!