Photo: AmerikalinjenSet in the 1919 headquarters of the Norwegian America Line, this boutique hotel opposite Oslo Central Station leans hard into its transatlantic heritage of hopeful emigrants bound for New York. Expect jazz drifting up from the Gustav basement bar, a buzzy ground-floor brasserie and compact rooms dressed in warm woods and brass. It is the most convenient base in the city for train arrivals, and the airport express drops you almost at the door.