When you yourself are a tenant, you are obligated to arrange a sublease with your landlord, if you are subletting the entirety or part of your home for a limited period.
Most commonly you are allowed to sublet half or less of your home. A three-room apartment will often be rounded down, so that you can only sublet one room maximum.
You should always contact your landlord if you are thinking about subletting, as it can in the worst case lead to a termination of your own lease, if you do not follow the guidelines for your specific home.
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