Are they clean and keep the place in great order.

Clear/clean layouts are the way to go- Have a competent GC who has done conversion jobs like this.

You already asked for a higher deposit, so if everything else meets your criteria for renting to her, why not add an addendum to the lease that states while this is a 1 year lease, within the first 3 months, you can terminate it early...a way for you get out, not the tenant.Depending on how bad the black mold was, you may want to make sure everything is super clean before she moves it in.Her previous landlord is right in a way 'that her lease stated that no matter what the rent is due', but if the house is not habitable, that rent gets put into a special account that the landlord can't access until the problem is remedied.

Is there a requirement as far as how many employees you must have (i.e. cleaning employees-room ratio)?

We conduct annual inspections, furnace cleanings, etc. 

I have been cleaning house a bit lately.  

You can install the self-cleaning fill valves that have a little clasp on a chain that keeps the level-line bobber in an up position until the toilet is flushed.  

What might be the thought process of other experienced investors, if its clean over the last 40 years, should I get it.

I'm thinking I should get the double panes for the insulation (hot in Florida), but only the single hung (tenants don't clean windows).What are your thoughts?

Tell me, would the transition be even easier if the tenant left the property in broom clean condition?