German business visa accommodation certificate

If you contact the house locally and confirm your stay, you don't need a hotel reservation certificate. The key is to have a definite address after arriving in Germany, which is more concerned by visa officers, so both hotels and private houses can be used as proof of accommodation when submitting visas.

You should ask that foreign student to issue you a lease contract of Zwischenmieten or Untermieten, which can be bought at the local stationery store. Then sign and fax. Sign it again and it will take effect.

As for whether a hotel needs a deposit, different hotels have different regulations. Even some discount rooms are booked with Visa cards, and the hotel has already taken the money whether you go or not. It is recommended to consult clearly before placing an order.