The location of the apartment was superb, close to many attractions (museums, churches, libraries, etc.), nice and interesting streets, shops, restaurants. Easily reachable by metro (Airport line). The railway stations was less than 15 min walk from the apartment. Douro river is not far from the apartment where you can take the Douro six bridges cruise.
Communication with the host was very good (useful tips provided while staying in Porto) and they were very responsive and flexible with regard to drop-off of our baggage.
The apartment is small but cozy and is ideally for a couple (two people). We had a pleasant time there. Thank you for the hospitality.