However if I do this I know this tenant will bad mouth me more frequently to the other tenants in the building.

Im in your part of Florida frequently.

I'm personally not a fan of 3/1s for MTR.

The two most frequently used companies for this service are KBKG and DIYcostseg. 

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I had to ask questions to get explanations about frequent repairs.

We hear about off market stuff fairly frequently.

Then she demanded a second fan.  

I am American, but I moved outside the states a couple years ago, but I expect to start spending more time back in the PNW in the the next few years, and a stretch goal is to be able to accommodate friends and family when they visit, which should be increasingly frequent.

Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.