PERFECTLY located near Rua Da Prata and a short walk to lots of attactions, including the Castelo de S. Jose. Despite being in the center of it all, the windows do a wonderful job blocking out the sound - it was very quiet at night. All the rooms were well appointed and check-in & check-out was fast and easy.
The upstairs bed is a little hard and the ceiling on the top floor is short, as others have mentioned. Additionally, the room with 2 beds does not have an air conditioning unit in the physical room so you have to rely on the one in the dining room.
Overall would definitely come back and stay at this Airbnb. We stayed at others in Lisbon during our 10 days in Portugal and this was definitely the best!