Great little place very cute with the massive windows. Downside is that the square in front is a building site with associated noise and dust (8am-6pm) but the owner is very upfront about this.
Very close to everything you would want to see and do in Porto.
No AC but pretty typical for an old building in a country that usually doesn't need it. Owner brought a fan promptly when asked during the heatwave (40+)
Would definitely stay here again but possibly only once building work has finished.