We were on the 3rd deck, we had a pullman bed for my 30 yr old daughter, there was a little vibration, but, nothing we couldn't adjust to. We really enjoyed this cruise, she's a beautiful ship.
Embarkation went smoothly. We were on board within an hour. Their security machine had broke, which made for a wait of 20 minutes. But, lemonade and cookies were served in the waiting area.
The Centrum area is awesome. It goes from the 4th to the 10th floors, center ship. There weren't a lot of activities to do on the first sea day, Sunday, that was also the first formal night. On a percentage scale, there were 5% tux's on men, 10% in casual wear, 75% in suits and 10% in jackets with no tie. My husband wore a suit. The ladies were 70 to 80% semi-formal, 10% formal and 10% casual. We had main seating, table 157, a table for 4, there were 3 of us, so that made my hubby and daughter happy. We were on the 5th floor, of the dining room, it is 2 floors, 4th & 5th. All glass.