The apartment is nicely located in one of the oldest areas of Lisbon. There is definitely late night street noise but this is the trade off for having nice restaurants nearby and easy access to the castle and other interesting sights. There are several flights of stairs to the apartment front door and then an additional small narrow winding set of stairs to the upper bedrooms.
There are some repairs that need to be done to the apartment itself which I notified the host of and the reason why I did not give it 5 stars.