I still think that the appreciation question boils down to the "Do people with options want to live here?"

If that's what you're really after I would start with the basics of what kind of bank loans either residential or commercial are available to you - not saying this is the best option, but it's a good place to start.

Your options are limited. 1. 

There are a lot of investment options.  

Six-unit apartments are an excellent investment choice, and I’d be happy to help you explore options that align with your goals.Looking forward to hearing from you!

Those horror stories are typically from amateur landlords that don't know how to screen tenants.

Larger homes typically command higher prices.4.

The way I see it, I have 2 options: 1) inform her of her responsibility to turn on the heat or be liable for any damages caused by the cold weather or 2) turn on the heat myself.

They don't allow auto payments or automatically add late fees, and tenants would have the option to pull their payment back, which is not ideal.

It’ll save you headaches later if she tries to escalate things.Document Everything: Take pictures, write down the history of your interactions etcOffer a Transition Plan: Just like my client, I’d recomend offering her a temporary storage option nearby, or even a small rent discount, to show you’re not trying to kick her out - just keeping the property safe and up to code.