The apartment is super cool! It's actually even cooler than it looks in the photos. Everything was perfectly clean and it was very comfortable. The bed is bigger than described, at least a queen. The view from the windows overlooks the Douro River and is very impressive at night.
The location is great. Walking distance to all of the important tourist areas. The restaurants in the area are fantastic. Bring your walking shoes because Porto is built on some steep terrain.
One tip: don't leave the skylights open and unattended, we very quickly had an uninvited cat come into the apartment. Although he was friendly, he didn't want to leave.
Enjoy the apartment, it is really awesome!