Marcos apartment is a really cute, VERY central and clean place to stay.
You can reach nearly everything by foot within 15min. Also the Metro and bus stations are near by.
In the area are many great restaurants (vegan), wine bars, little shops and supermarkets.
The apartment had everything we needed e.g. soap, towels and a good equipment in the kitchen.
Everything was super clean and tidy, so one felt comfortable right away.
Marco and his wife had many great recommendations, where to eat (also vegetarian/vegan!) and where to go etc.
All in all the apartment was perfect for us two and we enjoyed Porto to the fullest.