Does it provide a more accurate estimated property value?

I was unable to get an accurate market cap, but seller says it appraised for $271,000.

No reason to be afraid of using other people's money, you just have to make sure that a) you're presenting them with something that is reliable and of benefit to them, and b) you're accurate with your presentation.

Their asking price ($750k) is about $200k-$300k too much in my short calculations, which I cannot even get accurate due to the crap numbers I was given...  

I'm also guessing that the purchase costs were $30K higher than the actual purchase price, as those rehab costs were rolled into the loan.Obviously, this isn't how you do the formal accounting, but adding and subtracting all the inflows and outflows should certainly give an accurate determination of the profit.

For those of you who are pretty good at coming up with your after repair values what is your methodology? Comparable homes in the area? Average value per square foot for the neighborhood?

As far as Zillow I believe their prices are not very accurate.

I find both of the sites to be accurate most of the time. 

You need to hire a property managerThis isn't exactly accurate Jeanette.

Please bear with me on the length; I just want to provide the right level of detail so you have accurate context.I'm in a decent position to  delve into real estate investment full-time.