If you read the posts in this forum, you'll find plenty of good reasons to keep your total student loan debt as low as possible, and to avoid private loans if you can find any other way to finish your education. Can you get a part-time job between now and August to cover your security deposit and first month rent while you wait for the balance of your aid packaged to be refunded to you? That would be the best solution, you'd pay no interest, and not start the school year with a large amount due on your credit card.
Now is a good time to take stock: What's the least amount of student loans you can get by on? What do you need to do to use your new credit cards responsibly and set yourself up to graduate with $0 CC debt rather than a massive bill that might make it hard to start loan payments?
In any case, I would never use private SLs to pay CC debt. Private SLs have very minimal protections and options if you find yourself unable to pay (unlike federal loans) and they cannot be discharged in bankruptcy (unlike CC debt).
