The accomodation is not directly arranged by the organizing comitee.
In the following websites there is information available on hotels and student residences.
RESA, Alojamientos y Servicios Universitarios
Col.legi Major Sant Jordi
Col.legis Majors Penyafort-Montserrat-Llull
Col.legis Majors Penyafort-Montserrat-Llull (Ramon Llull UB)
AGORA, Residència universitària internacional
Hotel HUSA Arenas
Further Hotels can be found in the Barcelona tourism website
Ajuntament de Barcelona