We stayed in Susana's apartment for 4 nights in September. And we really loved it: It's clean, fully equipped, and very cosy. It has a nice little balcony (with a roof) and its 5 min away from the metro station Marques, where you can easily catch a train to downtown Porto. But even by feet you can reach the city center in 20 min, so if you have some drinks and party at night you can one again easily find your way home.
The contact with Susana was really great, we exchanged some mails before arriving and everything was clear for us. When we arrived we also met her in person and she was just really, really nice with us.
Thank you Susana for your apartment and your help, thanks to it we really had a good time in Porto!