Very centrally located. Clean rooms with ensuite showers. Very close to the train station, but may be difficult to find, so check a map before arriving.
There's residential homes all around the city. There's also a lot of 3-star hotels with very affordable prices. In the entire city there's only one camping site Prelada, but it's a bit far from the center. There aren't many family houses to rent in Porto, so they'll be difficult to find.