Wonderful, fantastic, a perfect experience!
Rui is a perfect host, he can give you informations and tipps about Porto and he is very helpful. There are two large bedrooms, bad, kitchen, living room.
You reach in less than 5 minutes the waterfront of Vila Nova de Gaia, in ten minutes the bridge Dom Luis. The tourist busses start stop next to the bridge, the RIbereia of Porto is at the opposite a head, only a short walk. If you want to use the metro, you should now that you have walk about 15 minutes and make some altitude difference.
Enjoy it!