I can only say good things about Casas do Teatro. The welcoming was overwhelming, there was a welcome basket with fruit and some food and they even offered some delicious Porto wine to taste. The appartment was clean, neat and very comfortable. They have atonishing views of the city from the top floor and the staff is incredibly nice and helpful. The location is very convenient too, just three minutes away from the cathedraI. I would absolutely recommend Casas do Teatro!