Mario was very helpful with instructions on how to find and enter the flat and where to park our rental car. Since we only had about 24 hours in Porto, we found the app with the suggested sight-seeing route very helpful! The apartment is very central, the center and waterfront are within walking distance, yet not in a very touristy area, so you can feel like a temporary local. Definitely make use of the breakfast vouchers as the place will probably be on you way to the day's activities anyway and you can stock up on pasteis to take home while you're there!