Mario's apartment in Porto was lovely, spacious, bright and very clean. It was located very centrally, and walking distance from everything you'd want to see in Porto- and the free app that Mario has developed will helpfully guide you to those places too! (Or the personalised paper map that Mario has also developed, if you don't have a smartphone!). Mario's communication throughout booking and confirming was always prompt and very clear and helpful, and then we spoke briefly on the phone when I arrived at the flat - he seemed very lovely over the phone, very welcoming and helpful. I would not hesitate to stay in this flat again, if I ever return to Porto. Thank you Mario!