I've heard that the Czech city of Prague is particulary bad for vehicle crime as well as street crime, pickpockets Etc. Government run tourist site even warns you not to bring any shiny fancy vehicles into the city <?> Every hotel either has a car park or a guard for street parked vehicles for residents. Hotel reviews normally suck, blaming UK stag parties and the like for trashing hotels and normally giving people a bad time.
We were supposed to be going there in June 05 on the bike, but after some in depth reading about the place, gave it a miss. Weather was the deciding factor, thunderstorms forecast for the full week, cobbled streets, rain and motorcycles just does not compute. We instead spent a brilliant time in Bruge & Bastogne, Belgium, Maastricht & Haarlem, Holland all absolutely wonderful cities that can take days to see. Hope you have a brilliant time wherever you end up.