Even if these people end up with great credit and are otherwise in a protected class, if they are also in a class that is not protected, like they are "someone who screams at their children (will be noisy)", etc., you don't have to rent to them and you'll be covered if fair housing comes around.Be friendly, but firm. 

If you start doing things like this, you’ll be receiving calls for a plugged toilet, replacing batteries at 3 am in a smoke alarm, a noisy neighbor, etc.

I had to explain that while they were noisy and ugly as sin, they posed no threat to humans.

My point is that upstairs neighbors are noisy!!!

Have noisy friends hanging around on the front stoop?  

They'd much rather have you take care of noisy neighbors, and fix things when they're broken. 

Mitigation work is messy and noisy.

I'd rather rent a nice 3 bedroom house in town and get two roommates than buy an RV to put on my parents lawn an hour outside of town.Also, just because you live in a college town doesn't mean all apartments are going to be noisy. 

We do not advertise the open house with yardsigns or balloons since we dont want noisy neighbors traipsing through, just online. 

Now days we need to look at Macro Economics and grand scheme of things, rather than worry about 1 or 2 deals.