I estimate the value of the house now to be $155,000 and it is rented for $850/mo. 

Maybe losing 10 lbs was not my personal definition of a success story when applied to myself, but for someone who has struggled their entire life, it might be monumentalThe reason I consider it a success story is because both my wife and I came from families that never owned property, never went to college, never accumulated much wealth at all, and were truly never financially stable at all.

I have an estimated turn cost through their site and feel like I have a pretty good idea of future capex expenditures with my inspection report. 

I know vacancy is a function of hundreds of factors, but in general, a property in close proximity to Ohio Stadium, downtown, the Convention Center, etc, - what is a conservative overall vacancy estimate for the year when used as an Air BnB type rental?

To use nice and round numbers/estimates, I have a 15k Personal Line of Credit, a 25k personal line of credit, a 40k Equity line of credit on 1 duplex, and another 35k equity line of credit on a different duplex.  

If not, you would likely need to account for that in your expenses. 2) I would make sure to factor in lawn care / snow removal (if applicable)3) Lastly, I would make sure to add insurance into your expenses.Otherwise, your numbers look good (although I cannot attest to your rent estimate as I do not know the area). 

Base on report,  create your construction estimate.

If they are happy to take your expert estimate on ARV, that's cool.

I mean I can only make an offer based on the provided rents and estimating expenses.  

I had a house sit for almost 7 weeks because the village required a permit and it took me that long to get a licensed plumber that would give me an estimate and put me on the schedule.