We very much enjoyed Mario's place. It was in the centre of Porto and his app helped find our way to the best spots quickly. The appartment has an artistic vibe, both inside and outside as there are all kinds of interesting unusual stores nearby. It made us very curious to Mario himself and we would've liked to meet him in person. His hospitality is great though, clear instructions, attention to detail, like the availability of a little children's bed for our son and the aforementioned app, and not to forget the breakfast vouchers. If you want to experience Porto we would surely recommend Mario's place!