You can't stay more central than this. Bang in the historic center of Porto, right next to all the sites, restaurants and transport links.
It is exactly as in the photo. Communication is excellent and you even get first coffee and simple breakfast for the first morning, in case you arrive late. Very thoughtful touch.
Yes it does get a bit noisy from the street, but what would you expect on Sat night/Sunday morning. It gets noisy in every city center.
I would recommend and stay here again as everything is walking distance from here and the apartment is beautiful.