We highly recommend this clean and wonderfully located apartment. Just below the castle but above two large city squares, we were able to enjoy so much that Lisbon offers with a short walk in either direction.
Lisbon is a city of many hills. The lower flatter section has a more cosmopolitan and busy feel. This location, however, is up on a hillside so it is quiet as there are no streets for cars immediately adjacent to the building (you instead can find a street for cars about 100 yards away on a flat walk or thirty yards up some stairs). Moreover the cool breeze rolling through the apartment at night (thanks to being up high) was fantastic. But to get the benefits of quiet and cool breezes, please be aware that there are two flights of stairs in the building (in addition to the walk up from the squares and metro). Ultimately, some of the best parts of Lisbon are on hilltops, so whether you stay down low or up high you need to be prepared to walk up and down lots of stairs and hills.
(Note: There is a tiny convenience shop with water, snacks, etc about thirty yards away and the apartment sits above a great cafe called O Corvo. Very good food, especially breakfast. There is also an ATM next to the little shop.)
It was so nice to have such professional and kind hosts. We were able to drop our bags early when we arrived much earlier than expected. We also had any and all questions answered immediately through Airbnb messaging or WhatsApp. Their management and availability was top notch.
We would definitely stay here again, and we will recommend this spot to all of our friends.