PrinsenOslo - Culinary Experiences in Kvadraturen Welcome to Prinsen Oslo, a unique lunch spot, restaurant, and event venue in the heart of Kvadraturen. Enjoy Mediterranean-inspired dishes for lunch or dinner, and experience live music in our historic premises. Perfect for an after-work beer, corporate events, or an à la carte evening. Prinsen loves the south, and our menus reflect the best of the Mediterranean and Norwegian ingredients.