Looks like the best bet is Longworth Hall. It's within walking distance to the stadium. Depending on the weather you may want to cab it over there though - but it's not too far to walk either.
Leaving the game just walk across the bridge & it will lead you to the Marriott.
I read on Craigslist that there's a bus trip from Pitt going to be @ Longworth, so we'll have plenty of others to party with. Heck, last week there were more Miami fans at the game than Bengals - LOL. Safety in numbers is always a good thing.