A deluxe sleeper in a Comfortline sleeping-car, originally built by German Railways for their City Night Line sleeper trains, now (from December 2016) owned by Austrian Railways and used on their Nightjet sleeper trains.
For more info & to buy tickets see
Similar sleepers run from Cologne to Munich & Innsbruck, Cologne to Vienna, Hamburg to Vienna, Munich to Venice, Milan, Florence & Rome, Vienna to Venice, Milan, Florence & Rome, Zurich to Prague, Prague to Budapest, Berlin to Vienna.
AloJapan.com