We drove from Lisbon to Dulce's place in Porto and as a result we had a bit of a weird check-in time, but Dulce was very responsive and accomodated us perfectly. We unfortunately never had the chance to meet each other but his friend who runs the gift shop downstairs was very helpful with tons of suggestions for restaurants, sights to see and ways of getting around.
We could not be happier with our experience in Porto, and wouldn't hesitate to stay at Dulce's Airbnb again or to suggest it to someone considering staying there.
Thanks again Dulce and Valentim!