@Justin,  No you don't need to provide notice however make sure to notify if you will be disturbing common areas, shutting off water to washing machines, having alot of workmen on site. 

Does providing complementally k-cups/teas, popcorn, spices, toiletry essentials (toothbrushes, floss, bath wash, shampoo, conditioner, soap, paper products, makeup remover, laundry detergent, firewood with firestarters for the fireplace and firepit constitute as substantial services?

Exterior maintenance such as pressure wash and gutter cleaning, these times we take care of them and usually at turnover.

What is the average age of the machines in the business?

I'm looking to subscribe to a service that helps find off-market real estate deals, and am considering options like Invelo, PropStream, Deal Machine, Property Radar, and others.

Now, wash, rinse, repeat and do it again and again.AN EXAMPLE OF HOW A WHOLESALE DEAL WOULD GO(This example is based on one of my most recent wholesale deals)I found a deal.

Wash, rinse, repeat.

A few years from now when all the dumb money that doesn't know how to underwrite washes out that may not be true anymore. 

Maybe add into your lease that the carpet needs to be steam cleaned when they move out (they need to provide a receipt for the rental of the machine or from the cleaning service). 

It might be a wash when you add up all those additional costs.