It is important that you make a reservation for your first couple of nights in the Basque Country at a youth hostel, pension (Spanish equivalent to a B&B) or hotel, while you find a permanent place to stay.
www.bilbaoakelarrehostel.com/ing/site/albergue.asp
http://albergue.bilbao.net/ing/introing.html
Ondarreta - La Sirena youth hostel in Donostia-San Sebastian