What Uni or what is the terrain like? How long will your trips be each way? Do you want something thats easy to just hop on and ride regardless of what you're wearing or will you nearly always be in shorts? How much stuff do you want to be able to carry (eg, will you walk to grocery or ride)? Will you be on bike paths or riding with traffic?

Unless you're planning lots of long trips over about 5 miles I'd try to find a good used upright bike with fenders and chain guard and internal gears and brakes. Easy to ride, more comfortable than a mtn bike, no worries about what clothes you have on, no maintenance worries. If it's flat, a single speed, if hills then 3, 7, or 8 speed.

Sitting upright is also much better for communing with others than if you're leaning over on a road, mtn, or hybrid bike.