Andre's place is great for any solo travelers/couples looking for a quiet place to stay in Lisbon. It offers a great view of the city and is close enough to public transportation to make the rest of Lisbon easily accessible.
Just a note: The place was great for me because I'm on the shorter side, but if you're tall (i.e. above 5'8"), I wouldn't recommend staying here, unless you're alright with crouching!