Since June 1, 2015, the landlord has to pay the commission fee.
There is no fee for the tenant any more. It used to be different before June 1, 2015.
So if you read that you have to pay a commission fee somewhere on the internet, these articles were written before June 2015.
You only pay ther rent of an apartment. Sometimes WIFI and parking is extra, sometimes it is included. Please find all information on the expose of each apartment.
Final cleaning always has to be paid extra.