You'll most likely be staying in the Kingsmill building. It's pretty swanky. Rooms are grouped into pods of two, with you sharing a sitting area, TV, mini-fridge, and of course, bathroom, with one other person.
Rules-wise, it's not all that bad. There's the occasional inspection, which they generally do just by having the accommodations officer let herself into the room while you're in class. They're looking for cleanliness. Just keep the bed made (And no, you shouldn't need hospital corners or anything like that), don't leave any food laying out, keep garbage where it belongs, and ensure that your rooms are locked, and you should be good. They'll only move to (Or threaten to move to) full basic training style inspections if there's an ongoing problem. There was also a no-alcohol rule for the building when I was there.
Venture also has one of the best cafeterias around. Seriously, you'll be eating rather well while you're there.
And yes, you can get internet / cable while there. If I recall correctly, the cable was included already, whereas the internet we had to arrange for / pay for ourselves.
And of course, the standard disclaimer. This information was accurate as of Jan 2006. Things may very well have changed. Your mileage may vary.