I have stayed at MC a couple times and thought it was fine...not fancy pants but nice big clean room and friendly staff. Unfortunately the pool will be closed as they have a fun wave pool.
I have had a decent room at ballys but the lobby is a dump. Maybe Paris or Treasure Island will have a deal.
But as others have said. ..you should have no trouble getting a cheap room for that time so you might be able to find something nicer especially for mid week.