Hey @Robert Mendenhall,
New house hacker myself. My wife and I settled on a small multi family approach, so we were able to purchase a duplex last December.
Some things I looked for in the house hack:
1. Location (rapidly changing/close to amenities)
This will hopefully make it easier to rent and give you options to rent out short term if desired. Most people renting short term prefer to be closer to amenities/main location IMO.
2. Value Add
This gives you an opportunity to renovate the property and force appreciation. This will give you a buffer if there is a down turn in the market.
If you're leveraging a low down payment, then this can majorly boost your return, because you get 100% of the appreciation not just 3.5% or 5%.
3. Save on Cost of Living
I'd say it is difficult to find a house hack in today's market that cash flows or leaves you with $0 to pay every month unless you're getting very creative. If house hacking can decrease your monthly housing expense, then it can be very beneficial in the long run. I'd argue that house hacking even to pay a similar amount compared to prior renting, because you'll get all the other benefits (appreciation, amortization, & tax benefits).
4. Ideally be able to rent both sides to cash flow in the future
If your property can cash flow after you move out, then you are in a strong flexible position. You can have options to stay, sell, or continue as a rental.
These were some of things I looked at while analyzing properties. I think you would be wise to make sure you could cover the entire mortgage like others have mentioned, because things do happen. If you're relying on that income to cover the cost, then you can get in some financial trouble. However, don't let fear dictate all of your decisions. Sometimes you need to calculated risks, especially investing in assets like real estate.
Good luck with your search. Don't hesitate to reach out if you have any questions! :)