Maria responded extremely promptly to my booking and was a welcoming host. At check in, she offered local suggestions of what to visit and where to eat, and answered questions about Douro river tours.
Maria's apartment is excellently presented, stylish, modern and spotlessly clean. Normally studio apartments are cramped, but the layout and partition of the apartment makes it feel far bigger and lighter than it would seem from the floor area. The apartment is in the centre of Porto, walking distance from the historic riverside, and next to excellent restaurants, cafes and bars. There is a train and metro station less than 10 minutes' walking distance away.
I would recommend Maria's apartment to anyone.