We had an amazing time in Porto. I highly recommend this flat, Mariana is a lovely and sweet girl, very helpful. She gave us very good tips about the city, where to go, what to see, where to eat, I am a vegetarian and she even recommended places for me to eat a nice veggie dinner.
The flat was amazing, super clean and tidy, all the amenities you can possibly need, some welcoming port wine, coffee, fruits, water. Clean towels and bed sheets. Map of the city and recommendations. It is quite central and the area is quite nice.
Don't hesitate; it is a complete win. :)