Lol, I wish I had gotten a $100 credits on my supposed to be CL but same priced room in November!
The Deluxe rooms are nice. One bank wraps around the passenger elevators, the other bank wraps around the service elevators. The one I stayed in was by the passenger elevators. I could hear a bit of noise at night when it was quiet - some general whirls and an occasional mechanical noise. This was VERY minor, but just a small observation.
How many are in your friend’s group? The bathroom is off the bedroom, some don’t like that setup, but for most I suspect a non-issue.
Hope they enjoy the Tower!