Mario's appartment was just THE PERFECT APPARTMENT. First of all, we arrived quite late (1 am) and Mario's father in law was waiting for us. Communication was perfectly clear from the beginning. We were welcome with 2 pasteis de nata (portuguese sweet speciality), porto and 2 small bottles of water. The appartment is fully equipped with everything you want to cook. The neighbourood is very quiet and we slept like babies. The appartment is also very well situated (very close from city center) close to Majestic café and rua Santa Catarina. We did everything walking. I would highly recommend Mario's house to visit Porto.