We highly recommend this air BnB. The city center is super close around 10 /15 min approximately by walking. You have the Trindade metro station 5 min walking distance where you also can catch the metro to the city center or surroundings and also the metro to the airport is starting from there (2€ approximately 30 min drive). The apartment is well equipment and we did not miss a thing. Also the communication with the host and check in / check out was perfect. We got so many tips and ideas when we check in. Thanks a again. And if we will visit Porto again we definitely will come back :-)