I also owner-occupy one unit in a 4-family. Financial-wise, it's a no brainer. Living for reduced/free is ridiculously good.
The biggest thing you need to consider are the numbers. If it's not or you, even landlording/tenant screening can be outsourced to a management company.
Rental income covering the mortgage is not necessarily a "good deal" (despite what all the agents will tell you).
Does it cover the mortgage taxes, and insurance?
What about monthly maintenance and a repair budget (Capital Expenditures)?
Does it cover utilities, water & sewer? Trash, snow removal, grounds keeping?
How about vacancies? Does rent cover that too?
If it covers these, gives you income, and provides a cash return similar or above what the stock market would give you, then go for it.