My thoughts: If you are going to use a PM, hire out the cleaning and any maintenance/repairs, you will be giving away 30+% of your income.
So you need numbers to put on your spreadsheet.....1) what are you estimating for your nightly/monthly imcome? (Hint - go on VRBO and see what your local competition is charging). 2) How much do you intend to put down? Let's say 20%...now let's do the math:
You offer $320k, 20% down is $64k so you finance $256,000 @ let's say 6%....you neglected to mention where this property is(!) so I used 1.5% as a property tax number, and I used $200 mo for insurance. Your monthly 'basic' expenses are $2134. Add a CapEx withholding of 10% ($225) and your PM fee of 20% ($450) to this. So monthly expenses are $2809.
I'm assuming for the sake of this conversation that you charge $150 per night and are occupied 50% (15 nights a month), so your projected income should be $2250 per month.
If the above numbers are accurate, you will have an operating loss of -$559 per month. So no, tis is a horrible deal for you.
Now of course I know nothing about your property (since you provided so little detail) so if this is a huge 5 BR house with pool on a lake somewhere, then you need to adjust my numbers. But basically, you need to run numbers like above to know if a deal is worth doing or not......