You going to manage it yourself or pay someone? Paying someone could cost you $125 to $150.
Even if you plan to do it yourself, life happens, so keep that number in mind.
Vacancy %? A month every other year will cost you 1/24 of the rent per year, or (rounded up) $55 per month.
What condition is the property in? Brand new? Or getting to the point where stuff will start breaking?
Let's assume 10%, or $125 per month..
Basically, if you sell, you'll get almost nothing out of it ($5k to $9k) after you pay the realtor and any other sales costs. So, in effect, if you keep it, you're investing $5k to $9k into it.
So, for an investment of $5k to $9k, you're in a position to make a positive cash flow of about $152 a month, or $1824 a year. Not a bad for a $9k investment and damn awesome for a $5k investment.
And that doesn't include depreciation and mortgage interest which will shelter some of that income from taxes, nor does it include equity paydown by the renters.
If the above supplemental numbers are accurate, I would go for it.
Assuming I could handle a $5k to $10k sudden repair bill.