Super small apartments. Not just small, but veeeery small. The pics you see of some the big rooms with couches and desks are all common rooms for all guests. So it could be confusing. And of course visually everything is great. The location is nice too, right in the touristy area. But the price is way too big for such a tiny apartment. Also, the sound isolation is poor.
But generally, great visual identity. Not sure what this does to the authenticity of Porto though..