Property Cash Flow Analysis

[Johnny On]

Hello, this is my first post on here. I created an app that looks through house listings in a certain area and compares the cash on cash return for the year. This data is based on current interest rates for rental properties, estimated HOA fees and property tax, as well as estimated rental income using zillow's API. For example, here's a line from my database:

Rating	Street Address	Zip	Price	Zestimate	Square Feet	$ per sqft	Bedrooms	Bathrooms	Rent Zestimate	Low Zestimate	High Zestimate	30 year rate	30 year gain	30 year % Cocr
A+	23219 Lincolnshire Dr	44140	169900	237037	1468	116	3	2	1650	1403	1848	988.62	414.38	14.63

I've identified places such as Indianapolis, Jacksonville, Milwaukee, and Cleveland that provide good cash on cash return based on these parameters. I was hoping there would any investors within those areas that can give me insight on the nuances of their particular market. 

Also, if anyone is interested in my program or have suggestions on how to improve it based on my description, I would greatly appreciate it!