We enjoyed our stay at Nuno's home in Porto. The place is unique - set in a private mews-like block with a gate, and the place is exactly as depicted in the pictures. There are three levels and three rooms with two baths. The third room in the 3rd floor has a low ceiling so good for little kids or adults that want to pretend it's a fort ;). Location-wise, it's walkable to everything: Livraria Lello, Clerigos Tower, etc.
And Nuno was a great host! He was always quick to respond, and even though he couldn't meet us the day we got there, he had his lovely father meet us instead. The only issue we did have were with the TV and the lights going out one night, and he and his dad came over right away in both instances to check out and resolve the issues. I would definitely recommend his place when in Porto!