If you like to stay in old town in Lisbon, here is your good option. The location is very close to the every part of the city center.
PS, if you prefer a quiet place to stay, you might have to consider the building is very old so the sound proof is not that good. Besides it closes to Pub area, it is very busy in the evening.
Watch out you personal belongings when you go out to drink. We got stolen in the street.