I would definitely raise the rent.The concerns I would have are: people that go to Hotels dont clean up after themselves so who would maintain the property?

It just shows an utter disdain for you and your business, and frankly a lack of appreciation for the effort you made to provide a well-maintained home at a reasonable price for he and his family.If he had responded more diplomatically, explaining he did not cause the damage and if he generally took care of the unit and was not a problem tenant, I might have been more inclined to work something out.  

Super clean, really well maintained and needs next to nothing.

While I don't particularly mind what I do, I certainly don't see myself doing it forever and view REI has a solid, long-term option to create other income streams for myself and a option I can start out in while maintaining my current job.

After a year, we’re planning on repeating the process while maintaining the first two units.

The first was a few months back and due to the yard not being maintained and some rubbish along back alley.

While the installer needs to make sure all is done right at the time of the set, the homeowner must maintain the grounds after the set.It will also be important to know when the home was set.

You may be required to join associations and maintain memberships (money).

Be careful of deals made with tenants where one of them maintains the grounds or does repairs and gets some sort of deal on rent or something, because that's essentially an expense. 

Landlords have a legal and moral obligation to maintain the property.