Mario's B&B was perfect for us during our stay in Porto. The studio was spacious, clean, and stylish! It is in walking distance to the river front, points of interests, and the Metro. You can easily walk to Gaia and to the cellars from the B&B.
The B&B came with breakfast coupons to a local cafe, which served fresh pastries. You can use the coupons any time of the day. Meat pies and Pastel de Nata were delicious.
Mario was a wonderful host - friendly and attentive. He even has a personally designed map of the city :)
I highly recommend staying here and if we are ever in Porto, we would book with Mario again!