Mario was a very friendly host and flexible in terms of the arrival/departure arrangements. The flat is located very conveniently steps away from the main city square. It is up a hill and then there are several flights of stairs in the building too, so definitely it was a bit of workout for us, which is fine after all the pastel de nata. The itself was rather clean and its size - perfect for 1-2 night stay. There was a nice touch to welcome us in Porto - a bottle of port :)