Our stay at this place was really nice. It is very central and perfect to visit Lisbon by foot. Plus if you plan to go out, it is located in the party area.
The flat was clean. The building seems old but there flat is still clean. The wifi worked very well. The only thing was that the bed creeks a lot when you move at night and you can hear the party people until late even with the windows closed.
Still I recommend this place :-)