This place is in and near many historic sites....all within walking distance. Plus there are nice family run cafes up and down the street, along with a bar or three. Great little neighborhood and the park just up the street is terrific with western views. Plus, the unit has a great view of the river and nice little balcony with 2 chairs and bistro table for sipping wine while watching the sunset/sunrise (though it faces south, so you don't actually see the sun directly....just the colors across the old city).
By the way, this is a 2 bedroom, 1 1/2 bath.
And finally, the hosts were most accommodating and responsive. It's a small management company who really tried to help with a map, directions, and some recommendations of things to see/do/eat. I'll look for this place and them again when I return to Porto.