A new gem was created with Karls Hotel in Sigmaringen: this unique 4-star hotel is located directly on the Danube with a breathtaking view of the Hohenzollern Castle. The close link to the Hohenzollern nobility is reflected in the interior design. As a general contractor, APPIA oversaw the design, complete interior finishing and furniture production for the 72 rooms and suites, conference rooms, hotel bar, spa and fitness area: elegant, subtle and with a wow-factor.