Bernardo's place is a good solution if you want to avoid driving the car in Porto downtown. You can park in the streets around the house and easily reach the city centre by bus. Bernardo is very helpful and, as we arrived, he gave us a list of restaurants where to eat (downtown and also near his place) and things not to miss in Porto. He also let us store our luggage after the check out and called a taxi to the airport for us.
Thank you Bernardo!