The questions are: Some basic details: Name, email, Mobile Phone, desired move in date, credit score (if they don't know it I ask them to check it and call me back), gross monthly income,...Then some more specific questions - their willingness to answer and how they respond helps me learn a lot about them as a renter.Do you have funds available to pay one month rent ($XXX), security deposit ($XXX), application fee ($XX per adult), and lease administration fee ($XX) (total: $XXX)? 

May be appealing towards families with kids who get a kick out of it, or adults that like to act like children!

It would seem to be easy but what if a baby is born - surely they don't count as much as an adult. 

All adults need to be on the lease and re-key the property for each new tenant.What a tenant does with the keys, I neither care nor know about. 

So what adult did you speak to when you visited?

Well, that was an entertaining read.

This will contain housing for students and non-students, entertainment, parking, and short term lodging.

This is my first time entertaining such arrangement so would love to hear your thoughts or what is considered a ‘fair’ percentage for this particular scenario. 

Get an application from each adult... especially the current boyfriend who will be staying in the house.

As far as my experience level, I have been a mechanic in the railroad and equipment industries for my entire adult life, so I am very mechanically inclined.