From the Velorbis website:
This type of classic bicycle is called everything from a sit-up-and-beg bicycle, a vintage bicycle and a retro style bicycle, to an 'Omafiets' - (Granny bike in Dutch). In some countries the most common term is a commuter bike, utility bike or an upright bike. The most popular European term is the 'Dutch Bike´ or 'Dutch style bicycle'; a generic term used to describe typically a two-wheeled, utilitarian bicycle, with mudguards or fenders, a rear carrier or rack, relaxed loop frame or geometry, an upright seating position and generally an ‘old-time’ look reminiscent of the early 20th century. It is a style of bike you will find all over Northern Europe, from bicycle friendly cities such as Copenhagen and Amsterdam, to Hamburg, Stockholm and Oslo.