The first clue in a race across Europe

After much anticipation, Competitours participants have received a clue revealing the first destination in Europe, delivered in the form of an airline record locater code.

I keyed in the numbers on the airline website and . . . voilá! We're off to the land of ticking watches and fat bank accounts.

Sure, I've been there before. I spent precisely two hours in this lake-side town 18 years ago. First thought: It's clearly not an advantage that I've seen the place before. Second thought: oh gosh, which language should I practice? French, German or Italian?

Can you guess where I'm going?