Beyond that, however, you really need to do some digging and talk to current students who are involved in CSR/social impact and related fields.  Talk to club leaders and see what they have to say.  Our extensive article on 'Best B-Schools for Social Impact' (which offers some insights on Stern) should be instructive too.  Hopefully you can make it to the welcome events at each school and get a sense of the culture as well.  And finally, it would be ideal to think very carefully about where you want to end up long term; working in NYC/Philly/DC is somewhat different from working in Atlanta, for example, and these schools have relative strengths in their geographic regions.  Best of luck!