I'm not a Touro NY student, but I do live near Harlem. Taxi Driver New York is long gone. East Harlem still has the highest violent crime rate in Manhattan (which is still nowhere near what it was in the bad days), but Touro is not there. West Harlem, where the campus is (and I was just a few blocks away from there last night for dinner) is gentrified as ****. I would never feel unsafe there during the day, and at night you're also fine too.
Living/going to school around there might be difficult if you are the skittish type (there always seem to be a ton of homeless people, more so than in other parts of the city, whenever I get off the 2 at 125, some drunks screaming, the occasional shady character). Unless you're super sheltered or afraid of black people, you're fine. It's also pretty easy and convenient to get to the stereotypically "cool" parts of the city from there. You're not too far from the northern edge of Central Park. Lots of good coffee shops and new restaurants in Harlem, as well as luxury condos even!