I really enjoyed my stay at the flat. The flat is bright and nicely decorated. The beds were comfy. Bomfim is a great neighborhood as you get the feeling that actual Tripeiros (people from Porto) still live there and not just tourists. There's a bakery across the street and a supermarket nearby. Metro station Heroísmo is visible from the flat and the bus 207, that leaves right next to the metro station, takes you to Foz do Douro (the mouth of the river Douro).
I arrived early, but Miguel and Ilze let me leave my luggage at the flat and so I could go for lunch without having to drag my suitcase around.
Highly recommended!