In your case, you thought you could offer some cash and they would suddenly play nice, move out, and leave you with some light dusting and an unflushed toilet. 

No stairs, pink & yellow tile, shag carpet, floral wall paper padded toilet seats. 

Final connection to the power source either Power Grid or Alternative Energy option.Final connection will probably need to be inspected before a Green Tag is granted and power turned on.Mechanical - Not sure that a Cabin in Montana needs an HVAC system, maybe just a Fireplace for Winter and open window's with Fans for Summer.HVAC system may also need to be inspected, started, and possibly you may want to order a Test and Balance since you have multiple levels the system may be a little complicated.Plumbing Trim - Installation of Sinks, Faucets, Toilets, etc.As mentioned above, you might be able identify a rough SF budget by searching online for each of the above items and any others that I've failed to include that other commenters may point out. 

I moved from traditional real estate and never looked back, no more leaky toilets, or undesirable tenants...

If you're referring to the pipe by the screens, that looks like a rough-in for toilet and the 2" coming from the 2x6 wall with the black cap on it appears to be a rough-in for a vanity/lav. 

Like if you need a plumber to change a valve in a toilet, or an electrician to change a ceiling fan, or a carpenter to replace a door; it might not be in your best interest to run an STR if you need the help of a realtor. 

They don't have anything in order, they don't do squat to document anything properly, they're nervous as a prostitute in church, they have no idea why they have to put on a tie and write things down, they sound like illiterate bumpkins in front of the judge presenting their cases, and they obviously resent having to be there at all, doing one of the most labor-intensive and least profitable activities for property managers.

It appears that they used the toilet, it got clogged and began to overflow.

None of it is worth squat without the deed.I agree about the percentage of 50+ ... but I'm not in the weeds I'm in reality.

I rented my property out to a tenant 1 yr ago and throughout the yr it was just nothing about nagging about minor issues that he is the one that caused all the issues, 1st was a clogged toilet twice from them flushing down paper towel and wet wipes (my mistake for not making him pay for it upfront, he agreed to take it out of security) after clarifying to them no paper towel and wipes in toilet, we never had any issues since.