It is located southeast of the Norwegian National Gallery, just metres north of the Hotel Bristol and Oslo Nye Teater, overlooking the courthouse square.
Darwin Porter of Frommer's describes the club as "one of the most congenial spots in Oslo and a personal favorite.
The place organizes concerts in most genres, although in the beginning it was a purely jazz club.
For a period in the 2000s, Mr Nilsen was part of the project National jazz scene.
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