In my STRs (beach market), couches are the most replaced furniture item, being updated every few years.  

@Lisa Beard In order to factor this into the deal, you would include a line item for property management in your deal analysis / underwriting.

For a savvy buyer a mini-split will have higher value than the traditional system.

You have to get a good deal of course and this financing is way easier than traditional financing.

The item that @Wes Evans noted is under "License Requirements" and I am pretty sure it is stating that if the ADU is constructed under the "Owner/Builder exemption" (no licensed contractor used) then the ADU cannot be rented out.

I would wait, you could put that money into bigger items to get a bigger and better value add.

Let's say you bought five $200K houses using traditional financing and put 25% down. 

The carpet is in terrible shape and the kitchen countertops (white laminate) need to be replaced as they are damaged from the tenants placing hot items directly on the counter.  

If you're working with a traditional bank/lender, getting your cash out quickly may prove to be difficult.

We can’t do that in too many places here in CO anymore because STR’s are now illegal lots of places but medium term (30+ days) furnished properties rent for a big premium over traditional long term, so I’ve done that on my last two projects.