Than the fact that the friend told you upfront what was going on is another plus.I would write down any concerns you have- neighbors, noise, damage, etc. and state that you will allow it if these added rules are followed or the friend has to go- ie- any police calls etc. 

Our towns should just address problems with parking, noise, etc. and fine for these accordingly. 

Why should you have to incur a cost for someone else's dog noise?

My  main concern is noise projecting to units below without any padding to deaden the sound.  

It’s been a slow grind but the Dickinson project is close to finished.  

If roughly equal, then think like a tenant -- consider things like parking, heating/AC sources and equivalent cost to heat/cool, noise (eg are the units side by side or above/below, busy roads etc), W/D hookups, how the unit "feels" (a sunny bright open unit will feel bigger than dark one), distance to attractions/bus lines/work/school/whatever.. 

I meant to ask if the blown-in is effective in terms of noise reduction...

They looked good on paper, but the problem was they couldn't close and I wanted to rent the unit.I'll admit it really cuts down on the amount of applications I receive, but the "signal to noise" ratio is much more favorable for my time invested.  

Find a reason that has nothing to do with mental wellness... noise violations, too many written warnings, late on payment what ever the rules are in your jurisdiction. 

Do not complain about the noise when you call 911 because it will only be handled as a noise complaint.