I recommend you this place to stay at Porto! Very good communication with house owners. Pedro and Maria were very warm and helpful. I was really surprised because they provided facilities for my son like bed, children's high chair, baby bath. During our stay we have all we need: microwave, washing machine, toaster, hairdryer, iron and bunch of Porto maps, buses timetable.
This place has really good public communication with old Town.
You can also count on Pedro for recommendation to great sightseeing and fantastic place to eat (the fish at Filipe was absolutely superb, ask Pedro for details).