I had suite 6100 and the Celebrity suite looked into my balcony and I into their cabin. Luckily they figured this out early on and kept their sheers and curtains closed on the two windows facing my deck. The upper suites did not do that, but how many times does a person go up to the window in those suites. The best part about cabins midship is reduced movement so it is a trade off.
CK- I say keep your room on the Millie. I fought hard to get 7180 for the balcony size and the location of the elevator. The cabin looks standard size, but the balcony is larger according to the deck plans. Happy cruising! We are sailing 3-17.
CK, when are you cruising? We have booked 7175 and 7180 on the Millie for 10/21. We did this on the recommendation of a TA who had stayed in one of these rooms and told us that the balcony was larger. We can let you know how we liked it after we get back.