The studio was superb, very true to the photos, light, spotlessly clean and comfortable. Although it is tiny, it's very well thought out and has everything you might need for your stay. The location is perfect for discovering the city, a lot of important sights are accessible on foot and public transport is close by as well.
Mário was very helpful all along, he replied really quickly to messages and gave me all the information I needed. The possibility to leave my luggage after check-out the last day was a huge help. I can only recommend it and would definitely stay here again when in Porto. :)