Client got a 1099 MISC for a personal property (rented for less than 14 days). Should I just ignore it?

No, you cant ignore it..why would it be non taxable?

Rents From Personal Property

If you rent out personal property, such as equipment or vehicles, how you report your income and expenses is generally determined by:

• Whether or not the rental activity is a business, and
• Whether or not the rental activity is conducted for profit.

Reporting nonbusiness income. If you aren't in the business of renting personal property, report your rental income on Form 1040, line 21. List the type and amount of the income on the dotted line next to line 21.

Reporting nonbusiness expenses. If you rent personal property for profit, include your rental expenses in the total amount you enter on Form 1040, line 36. Also, enter the amount and "PPR" on the dotted line next to line 36.

If you don't rent personal property for profit, your deductions are limited and you can't report a loss to offset other income.

What you mean is that it is real property, held for personal use.  I think all the IRS employees who work the CP-2000 program have gone home, and if they come back there will be criteria that suppress notices with less than (just guessing) $2,500 of rental income.  But others will suggest some sort of add-it-in-then-back-it-out concoction.