There are several facilities for accommodation in Bilbao:
http://www.bilbaoturismo.net/BilbaoTurismo/en/tourists

Concerted hotels

The University of the Basque Country (UPV-EHU) has arranged special prices for some Bilbao hotels as long as reservations are made through:

VIAJES BARCELÓ S.L. (BCD Travel)

• See hotels and online booking
• Contact: Idoia Pérez
  Phone: 944 25 70 55
  Email: upv-ehu@bcdtravel.es