We were very comfortable in Marco's apartment. We cheked in with Cassilda, the mother in law of Marco and she gave us information about the area/Porto. She was very kind.
It was very central, close to two supermarkets and very close to ViaCatarina Shopping.
We had a baby with us and they prepared a bed and a bath tub for the baby as well.
Check in and out times were Flexible.
We highly recommend this.