Hello @ChrisBerlin
welcome to our community!
Here you can find a selection of useful documents (different languages - long and short versions) that explain how the process of finding an apartment for refugees works and what you have to keep in mind:
https://buendnis-neukoelln.de/fluchtasyl/wohnungssuche/nuetzliches/
Apart from that you can check out the information provided by our community in the following threads:
https://***.wefugees.de/k/questions/1800 (German) https://***.wefugees.de/k/questions/1809 (English)
https://***.wefugees.de/k/questions/1622
Speaking from my own experience I know how tough it can be to find a place in Berlin. Still I wish you and your mentee good luck!
Best regards,
Thorgen