Mariana's place is a perfect appartment to discover Porto. It has everything you need: comfortabele bed, nice shower, a kitchenette with fridge etc. You can walk to the city centre or take the metro. Extra plus: the busterminal is very close by if you want to take a trip to another city (we went to Coimbra one day!)
Mariana is very welcoming and helped us to find a place to eat the first night and said we could always message her if we got lost. So, if I go to Porto again I would definitely choose Mariana's place again :)