Hostels sometimes used to be thought of as dingy, crowded, last-resort lodging that was only for hippies, students, random backpackers and possibly criminals — and perhaps that is the impression that some people still have of them. That old stereotype is completely outdated in the many shiny and modern new hostels that have been popping up around Europe lately and competing with one another for a chunk of a highly coveted market. Hostels cater to …