Field help:
(2018)
Building name (address)
Enter here, for example, the address of your apartment in which you sublet one or more rooms.
If you rent out individual rooms in your own, private or rented apartment, you will generally earn income from renting and leasing, which must be stated in the tax return.
However, you only have to pay tax on the profit you have made. To calculate the profit, you must compare the rental income with the rental expenses that you had for subletting and that you are allowed to deduct.