Make sure the rental shows well because a sloppy rental will not attract top-notch applicants.

They are LONG term, so while returns aren't top notch now, history has shown that they do have a 12% growth and over time your money will grow.

@Benjamin Knight there is some great guidance here...the only caution I would have is QBO requires a lot of setup...i.e if your chart of accounts is not setup correctly...specifically for bookkeeping for rental properties it will end badly...hire a bookkeeper or CPA with RE experience if you go this route.Buildium has a top-notch accounting feature, but the rest of the features are dull and clunky...if your portfolio is small, maybe a low code platform like Airtable is good...and I can't believe I'm saying this, but a Google Sheet may do the trick.I think the key is professional guidance or review...reconciliations are critical to keep things in order...In my opinion this is best left to professional bookkeepers....well worth the expense

Automate as much as you can and get a a top notch pool person 

Then stick a cold chisel or screwdriver into the notch and split the nut open.

Top notch updates.

My last project I used Home Depot - competitive pricing - had them in stock - but certainly it depends the price point of your flip - Over that 500,000 K Price range you may have to step up a notch - if you go window specialty stores get many quotes - a lot of guys will price match their competitors.    

But I want to focus on making sure my Airbnb listing is top-notch as we get closer to the slow season. 

Make sure that your photography is top notch, and if not, be willing to invest in that.Second, make sure your property is top notch. 

Are you a top notch marketer?