What other features should I highlight to make my rental property that’s for sale more attractive to investors?  

Many OOS investors set themselves up for failure because they don't invest the time to ACTUALLY understand:1) The Class of the NEIGHBORHOOD they are buying in - which is relative to the overall area.2) The Class of the PROPERTY they are buying - which is relative to the overall area.3) The Class of the TENANT POOL the Neighborhood & Property will attract - which is relative to the overall area.4) The Class of the CONTRACTORS that will work on their Property, given the Neighborhood location - which is relative to the overall area.5) The Class of the PROPERTY MANAGEMENT COMPANIES (PMC) that will manage their Property, given the Neighborhood location and the Tenants it will attract - which is relative to the overall area.6) That a Class X NEIGHBORHOOD will have mostly Class X PROPERTIES, which will only attract Class X TENANTS, CONTRACTORS AND PMCs and deliver Class X RESULTS.7) That OOS property Class rankings are often different than the Class ranking of the local market they live.Class A is relatively easy to manage, can even be DIY remote managed from another state.

Now, why does the NC side of the Smokies look more attractive?

SFH will sell on a pure comp basis, but MF will attract investors looking for yield. 

Some investors buy one or two homes at a time, rent them out, then use that income to buy the next few.Start small, get a couple homes producing income, then use that cash flow to leverage more.

You’ll need a hook — pet-friendly, themed for families, near a specific attraction, etc.So yeah — it can be a smart investment, but only if you treat it like a business from day one and know the hyperlocal rules.

Since Airbnb fees increase the total charge, either of the following result - (1) host lowers amount charged so TOTAL amount still attracts customers (2) total amount is enough to decrease demand and hence increase vacancy time while consumers find cheaper alternatives either through less expensive platforms, direct with host, or at hotel, or (3) consumer stays home or goes somewhere else. 

your local meetups or top producing RE agents that do flips.. they will know. 

The best amenities are the ones that can't be added to any listing- views, walkability, proximity to attractions etc.

Action: confirm it’s income‑producing, not your residence; verify real property status in your state and with your lender/insurer; have a cost‑seg pro model the deduction vs. your passive loss limits; and pressure‑test cash flow so the tax play isn’t carrying a weak asset.