Instead of having my cleaning and maintenance crew change the door code each week, I'd like to be able to do it myself remotely.  

Adding a nice small decent garbage can at my pool side help to keep that area very clean nad this may be a good addition for you.

What if power availability is compromised by the local utlity by the time you are entitled, etc.

If yours is the only STR within 20 miles and there aren't any cities or larger towns within a 20-30 minute drive, you could easily run into trouble even finding a reliable cleaning person, let alone a full-service STR management company.I would also definitely take the time to find some comps on Airbnb in the same area as yours, with as close to the same bed/bath count as yours, and with the same finishes and amenities as you are planning to put in yours.  

In this section, I want to emphasize the benefits of seller carry financing, share success stories where it enhanced the deal, and highlight the tax advantages of utilizing a 1031 exchange.Seller carry financing is a powerful tool that allows investors to purchase properties with flexible terms and minimal upfront capital.

I guess they did not clean the unit for over 3 years and did not call the old property management company when things started to break. 

Also if you have a clean unit the new owner will be excited about the idea of renewing your lease. 

Can they be cleaned enough or is it replacement only?

If you have carpet consider a cleaning clause if you don't have one. 

If they see mold spots, they should clean it immediately.