The bottom of the kitchen sink cabinet was missing & had fungi growth that was never cleaned and replaced.

Usually, an attorney or a title company charges an extra fee to thoroughly make sure the title is clean.

I am not able to judge does it just need regular cleaning or mold inspection?

It may be easier to keep clean books that way...

However, you cannot deduct expenses directly attributable to the rental period (rental agency fees, cleaning, and so forth).

Only sell dogs you don't want to own to clean up a porfolio. 

You may also ask if your unit will be cleaned when they are done, but that could be a bridge too far.

All of the guests we have had have been very respectful/ clean and I wouldn't even know that they are there if I didn't know they had booked the space (I live on the property and my bedroom window is near the RV so I would have heard any disturbances.)2.)

- the Housekeeper/Cleaning Staff. 

I don’t raise the rent year-to-year with tenants, but when I am searching for a new tenant, I research both the government’s fair market value calculator and what the market can bear and that is where I set my rent.Prior to every new renter, I have the entire apartment deep cleaned by a professional cleaner and the carpets are shampooed.