This is a beautiful apartment in a fantastic location -- right by the cathedral, Sao Bento station, and the Dom Luis bridge. The apartment has been remodeled nicely and the design is on point -- better than my apartment at home for sure! While in a busy area, the windows are very soundproof. I also loved the light airy feel of the space, the high ceilings and the presence of an elevator for when you don't feel like climbing the four flights of stairs to the apartment. Nuno and Raquel were incredibly gracious hosts, very responsive, and even left drinks in the refrigerator and a package of Portuguese-made chocolates to celebrate my birthday.
The only reason I couldn't give it a full five stars was because there was some very loud construction noise in the building that occurred during a few of the days. While we were largely out and about, this wasn't ideal for those times we wanted to come back in the afternoon for a quick rest.
That said, I would highly recommend this apartment for anyone visiting Porto, and we thoroughly enjoyed our stay!