Porto is probably the best of Portugal, and one if the reasons I can say that is because of our wonderful stay at João's apartment. There's enough space for a group of 4 - 6 people. The location is perfect, the rooms are quiet. We were in Porto in winter, in the first days of January, and we didn't need the heating at all. João was very kind and gave us a full list of recommendations. We would have stayed a week if we could, and if I come back to Porto I'm definitely staying in João's apartment