Nice apartment! Two large bed rooms, livingroom overlooking the Douro river. Nicely equipped kitchen. Close to the cathedral and within walking distance of most tourist attractions. Only minor issue was the stairs required to get there, might be problem for older/disabled people. Also, bring earplugs since the seagulls outside on the river wakes up early :-)
Joao was very accomodating and kind and answered all our questions and gave good advices. Recommended place to stay for a few nights in amazing Porto.