You don't need to know their names or anything else, but you have to give everyone notice - even if only in a generic fashion.

Just hang huge artwork, put down a carpet, bright curtains, bright furniture & pillows, etc.  

I'll get back to them in a timely fashion on my terms.

We'll good old fashioned sweat equity is how.

Postlets, Craigslist, and a good old fashion sign in the yard.  

Another thing I would be concerned about is renting the 5 apartments in a timely fashion.  

There will still be some who apply who have a reason for automatic denial - they are willing to gamble that the landlord won't check them out ...But the answer is still yes - that way you are operating in an ethical fashion; those who have a reason for automatic denial should recignize that they are better off going elsewhere, and if they don't they can't say you never told them up front about why they would be declined automatically. 

I used an old fashioned receipt book that had a carbon sheet in it, so I'd be making a copy for myself at the same time. 

In no way fashion, shape, or form is it a good idea to keep these people.

Of course I realize the old fashioned save save save and for me this is not a problem.