Obviously some unexpected things happen, but have a plan.

Repairs and maintenance typically account for smaller, unexpected problems with the property. 

I always look at the fact that time is money, contractors don't show, weather doesn't co-operate and that blasted broken foundation, or the unexpected wiring or plumbing problems , or asbestos, or T111 siding, etc that always manage to find their way into the project have to be planned for.

I am a big fan in keeping proper reserves for each property I own (or plan to own) for two reasons: No. 1 - the bank would require it and No. 2 - because unexpected things can happen in bunches and at the worst time.

Looks like good numbers if everything is rented and operating as desired.You indicated that you have no money to put down.Things to ponder....Can you handle the $10,000 needed to get one of the units ready to rent.Can you handle a major unexpected expense if it happens? 

Unexpected happens, but if you have bought a solid investment it shouldn't take long to right your ship. 

Louis has so many of, you'll need to make sure you have enough in your sinking fund to cover the unknown and unexpected expenses.

Getting my hands dirty dealing with the unexpected, wheeling and dealing, and mostly putting out constant fires.

Where's the room for renovation not to mention unforeseen problems like old termite damage or an unexpected heavy up or new roof or profit:)?

Make sure you set aside 5-10% more $ on top of your rehab budget for unexpected issues and more time on top of your expected completion timeline. 5.