Outside of that, I have a good lease, fix everything that needs promptly, try to invest in my places as needed, and let the tenants know from day 1 I don't put up with damaging the property or not paying the rent.

A growing family prompted me to upgrade to a nearby house, which we did in 2013.

Serve it promptly, and then if they don't pay, you already have the paperwork going for the eviction.Problem tenants, and tenants who can't afford the rent can usually be avoided with a good screening process.Just move on. 

One realtor tried to trick me into signing one of these buyers agreements, and I promptly responded.

Prompt, professional response, attentiveness to every guest and all their questions, etc is key.

Twenty-four hours is presumed to be a reasonable notice in the absence of evidence to the contrary.(9) Promptly commence an action under Chapter 1923. of the Revised Code, after complying with division (C) of section 5321.17 of the Revised Code, to remove a tenant from particular residential premises, if the tenant fails to vacate the premises within three days after the giving of the notice required by that division and if the landlord has actual knowledge of or has reasonable cause to believe that the tenant, any person in the tenant's household, or any person on the premises with the consent of the tenant previously has or presently is engaged in a violation as described in division (A)(6)(a)(i) of section 1923.02 of the Revised Code, whether or not the tenant or other person has been charged with, has pleaded guilty to or been convicted of, or has been determined to be a delinquent child for an act that, if committed by an adult, would be a violation as described in that division.

I appreciate your prompt response! 

@Ron Herrera, your post prompted me to check what happened about your website.

In Ca, some courts have ruled that the discounted rent for early or prompt payment is really the contracted rent and that the discount is a late fee. 

The one time I hired a PM to manage this property, matter severely worsened as the PM never chased up late payments and didn't attend to maintenance issues, which aggravated the tenant.Conversely, I have always been prompt with maintenance requests and repairs.Recently the stove stopped working.