We really enjoyed this apartment . It was clean and comfortable and had plenty of space. It is located about one block from the hop on hop off tour bus stop number three and you can buy tickets there. It’s a block away from the river and easy walk to the historic center of Porto. I wouldn’t say it’s located in the center of everything but more on the edge of the tourist oriented area. We saw zero security issues. If you’re looking for a grocery store there’s a Mini Preco a short walk away in an area less visited by tourists. Nuno was readily available when contacted to initiate check-in. His brother met us on time and was helpful describing Porto to us. They had, as a welcome gift, two miniature bottles of wine and crackers and a bottle of water. The bed was quite comfortable and the Wi-Fi was excellent. We recommend this apartment.