Find below some general links about accommodation in Bilbao, which can be directly booked by you:

Solidary accommodation

KUVU: Programa de Convivencia
Bizikideak: apoyo mutuo entre jóvenes migrantes y jóvenes universitarios

Residences:

Atalaia Claret
Bidealde
Bilbao BBK Talent (Exclusively for highly qualified researchers)
Fadura Athletes Residence (for affiliated sportsmen)
María Inmaculada Bilbao Residence
Micampus Residence (100€ off discount for the first two months)
Miguel de Unamuno Residence Hall
Nuestra Señora del Rosario Residence
RESA Blas de Otero Residence
RESA San Mamés Residence
Santísima Trinidad Residence
 

Youth Hostels, Hostels and Guesthouses:

All Iron Hostel
Bilbao Akelarre Hostel
Bilbao Central Hostel
Bilbao Youth Hostel
BBK Bilbao Good Hostel
Ganbara Hostel
Moon Hostel
Pil Pil Hostel
Poshtel Bilbao Hostel
 

Flats and Apartaments:

Atxuri Appartments
AirBnb Bilbao
Badi
Edificio Santiago Appartments
Erasmusu Bilbao
Habitaccion
Holidu
Hometogo
Mendialai
Spotahome
Uniplaces
Wimdu