I fully enjoyed my stay in Porto at Sarah & Sebantiao's place. The room is quiet, overlooking the courtyard, with independent restroom and sink next to the room. It's located in the center of Porto in a calm residential area but convenient as 10-15 mins walk to the historical district Ribeira, 30 mins from the Airport by subway.
Sebastiao waited for me to welcome and kindly provided with touristic information. He is a talented young artist (nice painting on the wall). I met Sarah quickly. Thank you and all the best to both. I have already recommended the place to my friends and hope to come back again.