I had a lovely stay at Pedro & Irene's place. They are very good hosts. Provided me with information and answered my questions before my arrival. On arrival they welcomed me to their apartment, gave a map and marked places worth visiting. I also wanted to go to the beach south of Porto and they found out the best way to get there by public transport (bus 906, beach Praia de Madalena, recommended). The apartment itself is cosy, the room is large, comfortable with lots of space for clothes and a TV. Another couple stayed in the other room but I have not met them. A nice touch: coconut bath / shower gel provided in the bathroom.
The first night some noises from the street woke me up at about 2am, but didn't last long. Sounded like group of men arguing on the way from the club. The second night was quiet and I would definitely stay there again.