Your expenses could be more or less depending on the condition and age of the property, and since this owner doesn't seem to have it together, I'd err on the side of caution and expect the worst. 

Verses the SDIRA which you must have 3rd do everything and cannot draw from unless your of age

Vacancy can be 0-25% depending on turn over and what month they move out.Maintenance depends a bit on age of home but I would use about 0.1% to 0.2% per monthCap Ex depends on traditional (.5% a month) or private money (1%)Sales Expenses:  6-8% for closing and realtor plus about 2-4% for holding costs

Born between 1982 and 1995, Millennials (also known as Generation Y) are around the ages of 16-35 years old.

I usually look at the age of the roof, hot water heater,  furnace, etc.

What's the age of the property? 

Right now it's absentee owners, age 50+ who own the properties outright.

I think the answer varies on a number of things such as your age, when you plan to retire, how much you have to invest, etc.

You can also screen applicants (debt-to-income ratios, income verification, background checks, etc.) through tenant-screening services such as TenantVerification.com, ScreentheTenant.com, e-renter.com. 

The more info you have ie age, address the better the results you will have.