It tends to hide marks better.Walls: Neutral tones like SW Repose Gray, Behr Swiss Coffee, or Moore Classic Gray are renter-friendly and modern.Trim and Doors: Use a crisp white like SW Extra White or Moore Chantilly Lace.Accent Walls: For a touch of style, consider an accent wall in soft blue-gray. 

I've tried the lower 6-7% PMs and usually you'll either pay mark ups on repairs (what you've noted) or pay extra fees (i.e. labor hours, extra calls) that you may or may not notice. 

First, estimate what the renovation would cost, how long it would take, and how much extra you could potentially sell the property for once it’s fixed up.

I ASSUME you’re talking $400+ in extra expenses for providing water, power, sewer, gas, internet, communal area cleaning, and exterior maintenance.

One thing that I would like to add to this list is making an investment without having enough extra money to get through the medium times as well as the bad times.

If you don't need the extra money at closing and just want to pay off your current loan in hopes of a better rate, you could consider a rate term refi instead. 

I just wondered if working with one of these mentor groups would add an extra layer of expertise, or if it wasn't worth the hassle.

What is your motivation for an STR and the Hawai'i market?

I think if you have a little extra time, operating a smaller STR business can pick up some good income.

Home mortgage is $3700/month and $500/month extra payment towards the principal.