Mario's place is perfectly located right in the Porto centre. You have like 5 mins walk from Porto - Sao Bento station. The apartment is small but clean and well-equipped. As a person with long hair I personally was amazed about the quality of a hairdryer :-) It might be a bit noisy in the evening but when you close the windows it's totally fine. Mario himself is really responsive and helpful if you don't know what to see in Porto :-) Lovely stay!