Victoria Swarovski is, yet again, on her way to Vienna . The next rehearsals for the Eurovision Song Contest are coming up. For the past few weeks, she has been commuting between the Austrian capital and Cologne , where she appears every Friday live on camera as a host of the popular competition series Let’s Dance . Two high-profile shows at the same time—and yet, her countenance displays no sign of exhaustion. On the phone, she bubbles with infectious energy. A conversation about endurance, life in the public eye—and of course—Vienna. When you host the finale of the Eurovision Song Contest in Vienna on May 16, nearly 170 million people worldwide will be watching—are you nervous? Not at all. Right now I’m still very relaxed and simply really looking forward to the evening. I can’t see those 170 million people from the stage, so it doesn’t feel that tangible to me. I think I’ll be more nervous in front of the 10,000 people in the Stadthalle.…