Hello Aami,
a few addresses for you where you can ask for an apartment offer:
Bürgerinitiative Ausländische MitbürgerInnen e.V.
Neustrelitzer Straße 63, 13055 Berlin
****://bit.ly/2aLqLqm (Contact information see in menu on the left "Kontakt")
Evangelisches Jugend- und Fürsorgewerk
****://bit.ly/2aLpWhd
AWO Landesverband Berlin e.V.
Several organisations with offerings: ****://bit.ly/2aLqVOk
Common Contact information AWO Berlin: ****://bit.ly/2aLquDC
If you urgently need a room to stay for a short time:
Förderung sozialer Dienste
Contact information: ****://bit.ly/2aLrBmW
**** for postings in Wefugee Community and use our search slot.
Search term examples: "Berlin" and "Wohnung". Or "Berlin" and "room".
Good luck, Jan