I own one student rental in a nearby college town. It's been a great experience so far, but I've had the benefit of being fresh out of college and being able to place tenants myself.
Some quick things to expect:
-High turnover - it will be unlikely for any tenant group to stay more than a year or two. Most students stay on campus their first one or two years, and afterwards many will make impulse decisions regarding their living arrangements. It's not too difficult for a college student to move (i.e. limited amount of possessions)
-To counter what @James Wise posted above, many students will have the expectation that you'll be providing the appliances - dishwasher, fridge, oven, and possibly washer/dryer
-Some landlords find it easier to rent by the room, others do one master lease. Make sure you make it very clear everyone is joint and severally liable for any damages.
-It's a good idea to get the parents to cosign, especially if your security deposit is minimal
-From my experience, students like to have carpet in the bedrooms. If the carpet needs to be replaced in the living room or other common areas, I'd recommend a very durable, moisture resistant flooring. Beer does terrible things to carpet.
-If you allow pets, make sure you have a sizeable pet deposit, if not fee. You can justify the fee by noting that the funds will be used to clean the apartment in a manner that will allow anyone with pet allergies to move in without issue.
-If you use PM, budget at least one-month's rent for tenant placement. 50% for the services of the PM, and 50% for any incentives they use to get the unit rented.
Best of luck!