I am also running a property management company so we have a ton of data on returns.  

Ensure to look at factors with aid growth and also look at the supply data for the area.

Or is it hidden in data online?

Dwellsy's data shows that single family rental prices are up by 15%, driving an overall increase in median rent by 9.6%.

South Philly is a better flipping market right now due to the high entry price, the only times I've seen rentals work out is when you can convert a SFH to a duplex.

I am having trouble finding any other rental data on a home like mine in this area.

The process would be to purchase the property and then file a forcible entry and detainer (eviction) through court.

Is there anywhere I can collect historical performance data on short term vacation rentals in a specific area?

When I input things into the calculator for some reason the cashflow graph is showing "no data"What have I done wrong?

A good realtor has the tools and knowledge to pull data from local markets within specific geographical limits and rental characteristics to give you a very close number for the average rent you could expect.