It also has tenant and owner portals, which offers convenience for everyone.

Thank you in advance for any insight you can offer into the matter. 

Is it worth it for someone like me who hasn't done any deals yet, but is going to be making offers on my 1st investment property in the spring?

You can offer to buy these properties and assume the existing loan.  

@Brady Ascheman - No, if you are not offering the guests services that add to their convenience then there is no SE tax.

Owners mistakenly ASSUME all PMCs offer the exact SAME SERVICES and PERFORM those services EXACTLY THE SAME WAY, so price is the only differentiator – and they often select the first PMC they call!

Short-term rentals (STRs) are highly regulated, particularly downtown, so areas like Mount Pleasant, James Island, and North Charleston may offer more flexibility.

Of course, if you're in love with this SG location you can always offer less so it equates to a more attractive cap rate, especially if you're a cash buyer.

I haven’t received the quote back for this place yet, but other similar properties we offered on were in the $4k/year range for insurance.

Your property is similar to mine in great Indianapolis suburb with good schools owned since 2013 - worth about $300,000 (possibly could get a little more if in a multiple offer situation), property tax $6249.