The apartment is really amazing. You would just go to Porto, just to stay in this apartment :). It's very nicely renovated, modern and very stylish, with a small terrace. It has stairs to the different rooms, which makes it very cosy.
Also its location is good, as it's in the historical centre, close to the main street and very close to metro station Trindade, which has all connections. It's about 20-25 minutes walking to the river. The apartment was very clean as well.
Nuno was extremely friendly and helpful with everything. We enjoyed our stay a lot.