Can i leave money in my Rover account for my own vacations? And if so will i get taxed on that if it is spent on a sitter?

Taxable income is taxable income. It doesn't matter what you spend it on or where you keep it. Of course, you can leave the money in your Rover account as a convenience to pay for future Rover goods and services, but it has no impact on how the income is classified. It is taxable.

Be sure to change how you are paid out. If you are currently paid out via PayPal then it's automatically transferred to Paypal after each completed stay.