With all the "favorite/best" questions, I thought I'd start one of my own:
What's your favorite town in Europe of less than 100,000 people but more than 10,000, has at least 2 hotels mentioned in any of the RS guidebooks but is not a stop on any RS tour, has at least one American fast food restaurant, but no more than 5, has at least 1 train station but no more than one night train going through it, is no more than 50 km from an airport served by either Ryanair or Easyjet, and has a name that is spelled differently in English than it is in its local language.