Mario's apartment was easy to find, just across the road from the metro station. He was very welcoming and even showed us his own app- which was so helpful navigating the sights of Porto! The apartment was spacious and had everything you needed, our only complaint would be the beds and pillows could be more comfortable. Location wise being near the metro was handy, as despite the close-ish proximity to Porto's central sights, the hills can be exhausting!