The Apartment was fabulous. We have stayed with 5 person and 15 month old child.
Flat was equipped in everything what we need for us and a child (even toys!).
In the kitchen we have found everything to prepare a full meal (pepper, salt, olive oil etc. was provided).
When we get in to the Apartment in the middle of the night we was welcome by Maria.Also in the fridge there were provided for us some food and a bottle of Porto!.
Localization is just in the city center so you can see almost all of the interesting places by short walk.
In my opinion perfect spot to start sightseeing Porto!!