The dirty tenant should have wording in the lease about keeping the unit clean and should also be billed for professional extermination.

My other rentals have hardwood, and I really like the ease of cleaning them and the time saved when turning apartments.  

Other than clean the place up I really don't do any "fixing".  

I find it's good to keep the power on for the refrigerator; otherwise I'd have to clean it again prior to another tenant moving in.And I like to keep at least one light on when a unit is empty to give the impression that it isn't (empty).  

Are you including cleaning of common area, repairs, pest control, and landscaping under maintenance?

You will have to clean that up yourself.

Do Realtors routinely ask the seller "what are you going to do with the money?" 

I have application with clean background checks and credit score of around 680Income to rent ratio is 2.5.I have asked for a consigner.However I am wondering if There are any other options worth pursuing to mitigate the risk - such as ask for 3 months rent as deposit instead of one month ?

It's probably a lot cheaper for you to help the property manger to keep the place bug free and clean for a few more months than it is to have a court battle with an uncertain outcome.  

You need to service them spring and fall, including filling or draining the pans, cleaning the pans and vents, replacing the pads, ideally every season, and lubing the fan and the motor.