Paulo is the epitome of hospitality. Not only did he show up at the appointed time to let me in and show me around the place (although it's a very old building he's painstakingly redone the place to have automatic lighting and modern appliances) he spent the time to tell me about the city, places that I could explore and even invited me to join him at a local lunch hangout. He has a place nearby that does wine tastings as well, which was quite fun and he showed me around some of the historic center of town. I learned so much more about Porto than I would have otherwise, would heartily recommend for future travelers.