This place is honestly the best. Excellent location in both the proximity to city center, and the tranquility of the neighbourhood. The Torre dos Clerigos, Livraria Lello (if you're so inclined), the university and the Igreja do Carmo are within a couple minutes walking, and there are several nice places to eat and drink in the streets surrounding Casa Antiga.
The rooms themselves have such fantastic style, and are comfortable and very clean. Good showers with soap/shampoo/conditioner and towels provided. Every morning there's breakfast provided in the breakfast room, there's two gardens that I imagine are great to sit in during summer evenings, and there's a common room with books in several languages on a variety of subjects. For example, one of the books I picked up was one about azulejos (the portuguese tiles) but there's also regular novels. I felt at home and would recommend this place to anyone who visits Porto.
Muito obrigada por tudo, voltarei em breve!