Before you throw $500 at the idea make sure you have the data. 

Permitting will be huge in ensuring you are compliant with all building code requirements, especially if you ever plan to resell.

We would like to interview a couple companies to ensure that our interest are aligned on how the property will be managed.

Many accredited investors want to see your failures more than one super successful deal in order to see how you bounced back and what you have learned, as this ensures some more security for their capital investment.

There is a ton of data on here covering nearly everything. ;)

Since you are owner occupying the property, the loan underwriter is likely going to want to see the leases to ensure you can occupy.

My husband and I are handy, thankfully, so tackling as many of the repairs as we can to help ensure cash flow. 

(You’re giving them $800/mo now and trying to reduce it to $650/mo)The PM will ensure proper notices are given and no housing violations occur.

Can anyone recommend a good data visualization tool for population, job growth, etc.?

There is no way you can sue, but you can ask to have access to your items to remove them and the landlord can be present while you do so to ensure you don't damage the apartment (I'm not saying you would, but that will be of a concern to them).You can try talking to them, but from their perspective, you've lived there for 7 months without paying any rent or utilities and why would they allow you to stay?