We had a great stay here at Antonio's Guest House. The space is amazing well appointed and the kitchen is spacious!!! You don't have to cook as there are many restaurants in the area, but the kitchen is great if you do. The Guest House is in a perfect location, quiet, but a few streets away you have the Bolhao Market and many other shops to browse. And if you need laundry done just down the street is a lovely lady who will wash and press everything for you.
We enjoyed our stay and recommend Antonio's Guest House to anyone who visits Porto.