We've got a unique bond and combined experience that can make some serious waves in the market.

That combined with the call you received informing you that he moved out is good cause to believe the unit has been abandoned. 

Maybe not all allow, but many do.I don't doubt that they function, even if against the rules.

What are the essential pieces of furniture and amenities I should include to make the unit attractive and functional for college students?

Gabe,The top theory from the reports I've read and contractors I've talked to is that water got in due to a graded slope towards the house, and a sump pump that was not functioning properly.

-reliable "handyman" who can deal with minor repairs (make sure licensed and insured)-tenant self-inspection app or use third party service for inspections-vendors to service home functions, e.g. plumbing, electrical, HVAC, etc.

Such a fantastic book, FHA financing is a highly effective house hack and can be combined with a sellers concession or up to 3% with 3.5% down to reduce or completely cover closing costs.

The combination of lower occupancy and continuously increasing regime fees (insurance was a big factor) forced them to sell. 

I focus on buy & hold renovation combined with STR house hacks.

Either adding square footage to an existing functionally obsolete 2/1 or 3/1 or splitting off a double lot.