I would bet good money that they are paying below market rates.In case you missed it: get rid of them.Spruce the property up, study the market to determine a fair market rate, and find a renter that is willing to pay the market rate, pay the deposit, and abide by your agreement.Not everyone is cut out to be a good landlord.

If it's just you or just you and a partner, your best bet when looking to house hack a multifamily is to look for uneven unit sizes.

Shipping it to the cleaners sounds like your best bet.

I bet it will do well for you if you can find a contractor to help you out. 

Your best bet is to find some local meetups while you are reading about investing in books and on the forums. 

So your best bet is to find a title company in your area that's "investor friendly" or a real estate attorney that's investor friendly, to help you.

Thank you everyone for your beautiful, helpful advice . feeling more confident,  I discussed this with her and she agreed to sign the lease.

I would bet the duplex brings in more per month.

If you have a 2.4% rate on your first, a 2nd lien or HELOC is likely going to be your best bet to access the equity without incurring higher rates via a refinance. if you sell you wouldn't be buying a "second" property anymore. 

Similar to what others have said a Property Manager might be your best bet.