The most common website for flat offers and requests; also available in English, highly recommended:


Made by student government (AStA) of TU Dortmund and FH Dortmund; only in German and with a significantly lower number of flat offers:


There are also some facebook groups like...

WG & Wohnung Dortmund

TU Dortmund WG Börse


Also possible, but not recommended for short-term stay: (watch out, they often charge you extra commission!)


Also usefull Links, which you should check out: -- Which contains detailed and accurate information about Studying in Germany, this website is also translated into 10 different languages. -- contains detailed information about Germany Student Visa and requirements -- contains detailed information about Germany Health Insurance      for Students - This site contains very useful and detailed information about   studying Masters in Germany. - Here you can check if you need a visa to enter Germany. This side also contains how to apply for a german visa and the different types of existing visa. - Online marketplace for booking student accommodation