A usual situation is that the tenant has exclusive ownership of his own room and sharing the kitchen, bathroom and laundry room. By describing in the agreement on which parts of the property the tenant has or does not have exclusive ownership, the rights and obligations of all parties are guaranteed. For fixed-term leases, landlords can only increase the rent if they have provided in the rental agreement for concrete conditions allowing rent increases. In any case, the owner can only increase once in a period of 6 months. The landlord must inform the tenant in writing for at least 60 days before increasing the rent. A lease (often referred to as a „lease“) can be written or oral. It can be for a fixed duration (for example. B 6 or 12 months) or periodic (usually month by month). .