We had a blast in this apartment, which is super clean and located in the very center of Porto!
The only issue with this location is that its direct surrounding felt very hostile. As three young women, we felt really scared every time when we went home after midnight. Several drunk men would bump into us and make comments. A woman was blocking the small street at some point as she was injecting drugs. Once, we could not find our keys in our bag and a dangerously looking man started walking fastly toward us. When we finally got into the apartment we closed the door with an insane amount of adrenaline.
Catcalling men and drug use are unfortunately very common in Porto, but the location of this air BnB in particular is very scary. We would still recommend this stay because it is incredibly central and has nice rooms, but make sure that you are never alone at night as a woman.
The host is very nice and gives great tips about the city!