I couldn't be more satisfied with Mário's AirBnB experience. It is strategically located in the heart of downtown Porto, very close to metro stations, historical buildings and less than a 10 minute walk to the Douro shore and Dom Luís bridge.
The communication went really well on the weeks leading up to my stay. I was welcomed by one of Mario's staff who was waiting for me to give me the keys and some friendly tips about the city.
The studio itself is super clean with minimal but nice decoration, exactly as depicted by the photos.
If you're looking for comfort and privacy in Porto, then this is definitely the place!