We had a wonderful stay in Carlos's apartment. It is located just on the edge of the heart of Porto on a small square with a taxi stand, and you can easily walk to all of the sights. It is close to everything with a market around the corner and a good neighborhood restaurant. The apartment was immaculate and very comfortable for the two of us. Carlos and his son, Miguel, were very welcoming and gave us great recommendations for things to see and do in Porto.