If you are looking for a furnished or non-furnished apartment check out the links below. Some information is only in German so the glossary of terms in this section should be helpful. You can also place an ad yourself or check the ads in the weekend editions of daily newspapers or on bulletin boards.
In Berlin, it is very common to share apartments as it is usually the least expensive option and the best way to meet people. Here are some online platforms where shared apartments are offered:
Check the weekend property sections of the daily newspapers and property websites ( e.g., Der Tagesspiegel, Berliner Zeitung, Berliner Morgenpost).
Bulletin boards displaying private apartment offers can be found in the main buildings of the university, e.g., faculty buildings, library, and dining halls. Mostly young people offer their furnished apartments or their rooms in shared apartments for a limited time span (called "Zwischenmiete").