Excellent location. Close to a supermarket. Bakery, café and resturants all on the same street, including convinience stores and even a place where you can get fresh fish. 5 min walk to a Metro station that is linked to all lines in Porto, including the airport.
The flat was very clean and had everything we needed with towels and linen. Only issue was communication, so make sure everything is confirmed with GuestReady before leaving. Especially if you ordered something on their website.