we didn't really meet 'Adelio'. The appartment is run by a company called The Porto Concierge. For the check-in, we went to their office, which was easy to find, and received the keys as well as very usefull information and local tips by a very friendly guy.
The appartment is really big, clean, with all you need to cook and live for a few day. There weren't any cooking basics, so we had to buy salt, oil, etc. The location is great : quiete street very near to a lot of restaurants and bars and at a walking distance to the center. They were very responsive to our questions and requests during our stay, even at 10pm ! Overall, a great hosting service and a great appartment ! Thanks TPC !