Compared to many other German cities, Saarbrücken offers fairly affordable housing for students. Here are your options:
Student Dormitories / Residence Halls of the Student Union Saarland (Studierendenwerk Saarland)
To rent a room or an entire flat in the student dormitories / residence halls of the Student Union Saarland (Studierendenwerk Saarland), you need to go on this website:
Student Dormitories / Residence Halls Studierendenwerk Saarland
Lot's of useful and important information as well as respective contracts about student housing of the Studierendenwerk Saarland can be found in this download section:
Independently owned and run Dormitories / Student Residence Halls
These dormitories / student residence halls mostly offer furnished rooms and single or double apartments. To get a place in these residences, you need to apply directly to their respective administrations:
The Carl Duisberg House: Das Carl Duisberg Haus
Student Housing of ESG: Wohnheim der ESG
The Cusanus House: Das Cusanushaus
Apartments of the SBT: Wohnungen des SBT
Apartments of WOGE Saar: Wohngesellschaft Saar
Private Accommodation
You can find offers for shared apartments (Wohngemeinschaften, short WG) and private accommodation in and around Saarbrücken here:
www.studentenwerk-saarland.de/de/Services/Kommunikation/Pinwand
https://www.campo-novo-saarbruecken.de
https://www.quint-immobilien.de
Ads in the Local Newspaper:
Saarbrücker Zeitung: www.saarbruecker-zeitung.de
Wochenspiegel: www.wochenspiegelonline.de