I do whole house HVAC systems, not window unit ACs. 

You may consider terminating the lease depending on how much time remains, your skills, the legal system, and other factors.Based on what you've said, I am concerned there's someone else occupying the home or something else is going on.

Random things like this.I can only imagine if they did allow you to add all the bedrooms, they would make you also add fire sprinkler system and a commercial fire alarm system like residential assisted living. 

We have lift pump systems in our lake house and zero issues.I would look on Amazon for soaps and shampoo's.

If you are seeking a company you need to make 110% sure they have the best systems in place and the way they are structured doesn't have any loopholes. 

There are also some challenges here as well to navigate but with the right systems and processes, section 8 rentals could be a nice avenue for you to explore.

:-)A sprinkler system in a cabin isn't going to do anything. 

I am a newbie re investor and I was wondering what all experienced investors use to manage their own rentals? To make it specific: What platforms do you use for your listings? How did you create your lease agreement? ...

Some examples of properties with high asset reclassification include medical clinics and hospitals with technical machinery and labs, grocery stores with machinery, shopping centers with rainwater drainage systems and large parking areas, industrial manufacturing facilities with advanced equipment, apartment buildings in suburban areas with swimming pools, golf courses, tennis courts and large parking areas for tenants.Here’s a list of the average amount of assets that can be reclassified into shorter asset life classes based upon the type of property.

As a first time out of state investor, I would not do a BRRRR to start until you build your contacts and systems there.