My coworker has a problem. Two months later he had a contact for rent with a man and a woman. The man has nothing to do and the woman is a singer. When the man and the woman rent the apartment, the man

First, the wonkish answer. Considering financial costs only, the cost of renting is simply your 1) Actual rent + 2) Renter's insurance + 3) Difference in uncovered utilties between a rental and owned property.