I don't want to be negative, please take all this with a grain of salt, but just make sure the physical property is in good condition because renters (especially low income/Section 8) tend to beat up properties and when you only have one stream of income, it can crush you.  

At this point, you've protected your primary and your life and you've still got a free and clear in your back pocket for a what if scenario.3. 

If there was a fire and someone could not open a window and they died.......well you get it from a life standpoint as well as a lawyer licking hos/her chops for that one.

@David HarleyIt is hard to opine on this without the context of market and property class/condition, but what I notice from the analysis is the CoC relative to loan amortization:  For a 25 year loan and $28k cash investment, demanding a return greater than 14% may be in your best interest.  

Can I remove them once the sale is complete, do I have to evict them, can they be forced out due to the living conditions?

I'm an aspiring real estate investor with the ultimate goal to one day own an apartment complex and live my life with full financial freedom.   

Refused to put pictures up I put in an offer and they agreed to let me go see it with my realtor (condition for purchase).

Life style changes?

(a) If a condition results from an insured casualty loss, such as fire, smoke, hail, explosion, or a similar cause, the period for repair does not begin until the landlord receives the insurance proceeds.

Literally nothing could surprise me at this point in my life.