I stayed at the Ferrotel and really liked it. Parking on the street with a short walk was no prob. I could have booked parking for EUR 5 but skipped it. There is a internet termin in the lobby and wireless Internet (free of charge) throughout the house.
The room was on the 3rd floor and nicely furnished. All of the interior is stylish and it seemed quite new.
Breakfast was good, but nothing special. If in Duisburg again, I would stay there again.
