Very nice flat. Modern interior, nothing personal if you expect a flat where real people from Porto live in. We did not use the tv, kitchen and things like that. The kitchen is fully equipped. Bedroom windows are to the plaza which could be noisy in the mornings even with closed windows(they start cleaning the streets outside at about 8h in the morning). There are many apartments in the same building rented to airbnb. Very secure area and the house is locked with several doors and access codes.
Check out was easy as we could leave the keys inside the flat and go away. :) We were not allowed to leave our luggage in the flat longer than 12:00. :(
Porto is a very nice city and the apartment is located perfectly that you can go everywhere by feet in 10-20min and it is not in a main tourist area. Many locals are around the flat.