In the last five years, rental prices have been rising by more than 40% in both cities Potsdam and Berlin. To give you a rough orientation:
We recommend that you deal with accommodations in a timely manner and that you also consider accommodation in the surroundings of Potsdam.
If you rent an apartment or a room, you must pay a rental deposit to your landlord. A deposit typically amounts to between two and three months' rent. The refund of the rental deposit can take up to 6 months, in some cases even more.
For stays of more than 3 months, you have to register with the local authorities. For the registration, you need a form called "Wohnungsgeberbestaetigung" that has to be completed and signed by your landlord.