I finally took a Nihola trike for a test ride and thought I would share my impressions.
Nihola is a cargo bike company based in Denmark. Nihola trikes, like Christiania trikes, are popular among parents there, as well as businesspeople who want to haul stuff, advertise stuff, or otherwise use a bike commercially.

Like the Christiania, Nihola trikes have a well-designed rain canopy, and have design amenities specifically aimed at carrying one or two kids in the cargo box: the rain canopy, a sturdy bench, seatbelts, and a carriage design that maximizes head and legroom.
Unlike most cargo trikes, the Nihola uses a steering linkage system. Most cargo trikes steer by using the box as the steering mechanism: the front wheels are on the box, and you steer by rotating the box on a pivot — the headset — which is positioned underneath the box, near the center. This sounds crude but can be quite sophisticated and well-engineered (as in the Christiania, with its inverse-angled floating headset, and hydraulic steering damper).









