I spent 5 days in Joana's apartment.
Joana is a great host : she communicates quickly and efficiently, she welcomes you with a basket of fresh fruits, and there is almost everything that you need in her apartment (in the kitchen for cooking, in the bathroom, and advices and books about Porto and Portugal).
The flat is located 5 minutes walk from the metro and the famous Bolhao market. It is well equipped and cosy, and very clean.
I definitely recommend Joana's apartment.