Please, make your own hotel reservations: Bayreuth Tourist Office.
Download the official Bayreuth Hotel Guide (pdf, 9.5 MB, in German, but very nice!).
When booking in a hotel marked with a *, mention that you're attending the BPS '11 conference at the University and ask for a special BPS '11 rate. A city-map is located here.

This is a selection of downtown hotel locations: Arvena Kongress* Bayreuther Hof Goldener Anker Goldener Hirsch Ramada Residenzschloss* Hotel Schlemmerland Hotel zur Lohmühle Weihenstephan

Visit the Emeritage and other points of interest!