Nearby to the venue site (within 10 minutes walking distance) the Welcome Hotel Paderborn (http://www.welcome-hotel-paderborn.de) offers for participants of the workshop a rate of 88.50 Euro per night including breakfast. Remark "Clustering Workshop" when making a reservation at this hotel. Reservation deadline for this offer is November 10th.
The city of Paderborn offers several hotels in all price categories.
Please, have a look at:
http://www.paderborn.de/microsite/welcome/tourism/hotels_inns_guesthouses.php
From all downtown hotels exist good connections with bus line no. 11 to the
Heinz Nixdorf Institut (HNI).