Great appartement in a perfect location to explore the city. Very clean with a nice view from the large balcony (you can also see the Douro river and Gaia from there). There is a huge street in front of the building, but you dont hear a lot of noise because the flat is on the 5th floor.
We were there with our baby and everything was easy accessible, there's an elevator and Francisco organized a baby crib for us.
He was a very friendly & helpfull host and gave us a lot of good advices.

I would definitely recommend this appartement if you want a nice unproblematic stay in the city center of Porto.