Guessing it's really just a bit of wall cleaning and touchups.

The place wasn't trashed, but seems like they did no cleaning when they left.

Car washes require regular maintenance, collecting cash, etc.

Our policies clearly state 4 PM check in, and I couldn't accommodate an early check in anyway because the previous guests were still there and had until 10 AM to check out, then the house needed cleaning.

You compromised your lendability by taking write-offs to show you didn't make much so in a bank's eyes, you didn't make much.Any alternatives that are come here (sub to, seller finance) aren't realistic for a regular home buyer.

I learned that I enjoy investing in value-add multifamily which has a great mix of regular cashflow, but also upside upon the exit.

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.

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.  

San Antonio is going to be policing the permits and regularly sending a list to Airbnb and VRBO to delist.

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