Friends don't let friends who aren't still undergrads live in Allston/Brighton.
Sorry, I couldn't help it. The reality however is that when you're bookended by so many schools with so many of its undergrad population living in that area, annoying things are going to happen. Besides the parking issues, you'll have the pleasure of hearing all the parties going on from Friday-Sunday.
I agree with the other people. Brookline is a better, more "grown up" alternative if you need to be on the Green Line. Somerville/Cambridge if the Red Line works.