when I first started lending in Detroit in 2002.. the rehabbers there would paint the copper in the basements with grey paint in the low light theives would think its galvanized and not take it.

Also, what are some other low cost amenities that I can add to my STR that will yield a higher ROI?

Quote from @Carlyn Chism:I agree with Chris on a lender that might be a scam or make you may so much money interest because of the low credit score that you make $1.00 on the flip or no money.  

I have been in the search of lenders with low or no minimums for purchase/ refi. 

Set up a contracts account at both Lowes and HD. 

Case in point, years ago we used Olympic paints from Lowes, which were carried for a long time.

With a low 4.75% rate but minimal cash flow ($50–$125/month), your equity could likely work harder elsewhere.

If before getting a permit you have to dance around for Code Dept officials/ city gov and crime is thru the roof, investments will definitely be low whether real estate or other, but it should be benefiting the city officials to keep things that way.

I'll see if I can use some of this because I get almost no Airbnb bookings unless I drop price way low.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.