I stayed in casa azul for 2 weeks while I had business at University of Porto. I wholeheartedly recommend choosing this space! It is extremely clean and comfortable, it has all the amenities for cooking and, most importantly, an air conditioner (must-have in the Portuguese summer). The location is also great, with 2 supermarkets, restaurants and coffee shops nearby, and a metro station (marquês) about 10 mins away. Antonio, who was assisting me during my stay, was extremely helpful and quickly answered all my questions. They are both amazing hosts!