This is a very nice small one room apartment. 2 minutes from the Douro river, 5 minutes from the Ponte Luis 1. This is a lively area with many bars and restaurants close by. About 20 - 25 minutes by foot to the centre.
The place is spotlessly clean. Communication with Mariana was good as well.
At night it can be noisy because of the sounds from the street. So for people with a light sleep I recommend to bring ear plugs.
It is a small place. So not something you necessarily want to spend your entire days at. But very nice as a base camp to explore Porto!