You need to maintain a comfortable cushion in order to cover your inevitable vacancy, maintenance and unforeseen expenses.

If you have more than a unit or two, Excel becomes too cumbersome to maintain. 

I maintain the asset and pushed up rents.  

I do this because I manage and maintain all my own properties at this time.

Would it be best to maintain the personal account for that other cabin and continue paying bills as we have, and then just have the LLC take a property management fee each month?  

If the tenants take care of both and the property is well maintained, I would consider it.I look at Mortgage, Insurance, Taxes,  Management (10%), Vacancy (5% varies), Maintenance (10%?). 

My labor costs are minimal in rehabbing/maintaining and managing our rental properies and the returns are awesome.

To increase cash flow you will need to turn over tenants every 2-3 years to maintain rents at market rate. 

You're not responsible for fixing every little thing, you're responsible for providing a habitable place and getting things fixed as needed to maintain that.Helpful hint, charge extra per mo and get a weekly or at least biweekly maid to keep up the common spaces.

Took freshmen year of college off from working because I was worried about maintaining my scholarship's gpa but worked in the school's post office and daycare other years.