Each participant is responsible for their own accommodation. There are many options in Heidelberg in the 50 – 100 euro price range.
Click here to for an overview on hotels in Heidelberg http://www.heidelberg.de/hd,Len/300652.html
Convenient and moderately priced accommodation offer the so called ‘Gästehäuser’, for example those offered by the University which is located next to the Marsilius Kolleg, http://www.uni-heidelberg.de/institutions/guesthouses/index.html,
or operated by private operators:
Information on Heidelberg: For a general tourist Information on Heidelberg, see here http://www.heidelberg-marketing.de/en