Im pretty good with tech and wouldn't mind a system that notifies me immediately once the tenant pays? 

It's in the systems we find efficiency and data driven results.

I inherited her when I bought the house and later realized she was playing games with the other landlord other landlord didn't tell me about this until after I closed. she's now playing similar game with me and seems like the courts system is helping her to do this.

Next thing I know I get a call from the repair person saying he's got the AC system running cool again. 

I then but a Tiny Home on it and set up my PV system and water catchment and lived there off the grid for 4 years.

The company is entrusting you that you will allow the systems in place to work in your benefit.

You need to build a skill and create a system for it.It's not as sexy as rentals or commercial real estate, but it works.

Usually, the excessive moisture is caused by a leak in the plumbing system underneath the floors and it is usually a hot water pipe leaking.I am a contractor and sometimes I find that the clothes dryer vent is broken somewhere and all the steam coming from the clothes as they dry is going inside the house and collecting on the cool glass windows.You can hire a contractor to look for a leak, or you can purchase a hydrometer online.

take a look at thread:  https://www.biggerpockets.com/...I don't know what State you are looking at or which tax system you are accustomed. 

Because it might be a commercial use, you might be required to have a sprinkler system and exit signage.