I know the booking system has had issues in the past. If one booked Palazzo it showed a Bella Suite at the Venetian. Easiest way is to call and check the hotel itself and they will help confirm the room you are actually in.

IME I usually get a call from VIP services at the hotel a few days ahead of time stating the room upgrade and asking if I have any questions. You can ask about additional upgrades or note any special occasions at that time.

You will get access to the VIP Lounge as an RA. They have some light snacks (tea sandwiches) and continental items throughout the day. This is also where you will be able to check-in and out of the hotel when you stay.