We stayed at Luis's place for 6 days. We were 5 people, implementing an Erasmus project. Luis helped us from the beginning to feel like home in Porto and to organize our trip well! The house is only 10min from the centre of Porto, 3min from the metro station and outside the house there is a bus stop!
Luis was always available to solve any minor problem we had in a less than an hour!
We highly recommend Luis's house if you are a group and you are going to stay in Porto.