One approach could be to let her know you will let her use the last month's rent as her deposit if she makes sure the house is in good condition and clean when she moves out. 

The renter paid for his mortgage and he was essentially able to live in the house for free. 

The house was rehabbed with good quality materials and overall looks great but should I be worried with unpermitted modifications?

Quote from @Jaesung Jun: @Jaesung JunYou don't provide nearly enough information for anyone to realistically offer valid suggestions to you.House hacking involves buying a multi-family house.  

House hack a duplex.  

Albeit paid her share of the rent, as metropolitan housing paid about 80% for her.

Paint an alluring picture of what the buyers life could look like.Lastly, remember fair housing rules (although a flat fee broker should review and eliminate any violations as part of their quality control process).

I feel that pain and we're not even looking at houses. 

I am looking for a house locate in a growing area for potential good tenants ( I will manage the property myself).

You can find properties in the price you indicated but they have historically appreciated less than inflation, they may attract poor tenants, they likely will have poor rent growth    Or house hack local market and need at low as 3.5% but easier at 5%.