Rates as low as 7.25, depending on credit score and LTV.

You capture the paydown, appreciation, and low payment.

Let's say at 6% over 30Yrs will be about $960 per month(Principle/Interest) with the remaining  interest only portion $40K costing roughly $200 per month. $1500- $960 + $200 IS $340Cash in your pocket after everything roughly $1500-$1160-$340 which is not bad for a 100% financed deal(INFINITE RETURNS)Now, If you ran this analysis on a 1% deal as @Nicholas L. mentioned you will undoubtably end up in the red each month.All the best!!!

Investing in a low-crime area.I'm not being facetious. 

Understand that the cost to the investor is only the cash that's out of pocket. 

You have to put 5% down vs 3.5% down, rates are usually higher, but if you have strong credit, your PMI cost can be cheaper than that of FHA loans. 

The thing that would deter me from this location is a background rate of appreciation of 3.12% and low school ratings.

The market still has relatively low entry points compared to other major cities, making it possible to find multifamily properties like duplexes and triplexes in the price range you’re targeting.

Then the prices lower towards the date and you end up booking at a low price or worse just being vacant.I think manually pricing your STR'S is a much better approach.So many people are looking for the next cool software app to buy a subscription to.

That is, how well did your deal analyzer estimates match the actual rehab costs, holding costs, ARV, and profit?