Mario's place is a great choice to visit Porto: it is central, extremely clean, tidy and well decorated. The heater works well and the rooms get warm easily. Mario is a very good host: we arrived later than the agreed time and, nonetheless, he was really friendly. The suggestions he gave us for food and restaurants were really useful: not touristy and with local ingredients. We had a great time in Porto and if ever back there, we'll stay here again.