The location is awesome! You are in the middle of the center and you definatly live next to the locals! Many stairs, but the view is amazing! The flat is also great. Totally normal but clean, and there is everything you need for a good stay. You feel save comfortable! We would always stay there again.
But just a tip by the way: never try to get there by car :) because of the small streets it is impossible. The taxis are not expensive, so park your car somewhere else and get there by taxi. But still then you have to walk 5 min. because of the small "streets". And also a car in Lisbon is unuseful.