Finding a hostel or a regular apartment in some University towns can be a real nightmare.
This has been the case for many years and the fact that there was a double intake last Fall Semester; more Germans are joining University than ever before and more foreigners from around the world are choosing to come study in Germany, has not made the problem any better. In some cities like Munich they have introduced programs where students can stay with the elderly. (Read: Kenyan Shares on A Partnership in Munich Between the Elderly and Students Where Both Profit ).
Here are cities where it is hardest to get accomodation for students.