After that, if issue is addressed but ground floor tenants keep complaining - remind them that common noises are expected when living in an apartment. 

If there's one thing to be aware of, expect the unexpected.

Landlord will promptly respond to Tenant request for repairs but will not be monetarily responsible for tenant disruptions or inconveniences during habitable times of repairs or tenant/guest injuries incurred in or around obvious areas of maintenance, repairs, or construction.We are more converned about them expecting us to pay for their losses rather than getting recouped for damages to our property. 

Good luck on your future! 

@Jared FisherRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

My goal of refinancing was simply lowering our monthly spending to reallocate towards future investments.

Hopefully we will be managing a handful of other STRs in the same market in the future.

Clear communication on expectations is key—I'd definitely push them to split that $250 cost at the very least! 

Some/many lenders don't like a 2nd mortgage behind their first (like the skin in the game), however there are both bridge or permanent financing options out there allowing you to leverage anywhere from 90% CLTV - 100% CLTV, but don't expect good terms...

It may or may not show on a credit report, depends on the servicing and you should have the loan serviced.Failure to include the debt on a future loan application is mortgage fraud, wanna go to jail?