Here is a photo of the aft cabins on Jewel of the Seas:
As you can see the angle makes it possible to look down on the balcony below. From above it can look like this:
This photo is taken from the Windjammer outdoor area. The small round table with a glass on it is on the balcony below.
I don't think that a balcony on deck 7 is as visible from above as a balcony on deck 10 is as the Windjammer area protrudes a bit, but I don't think it's 100% privacy on the balcony on deck 7.
The distance from the elevator in the centrum to the cabin is more than 1/3 of the length of the ship, i.e. more than 100 meters (sorry... tap tap tap... my calculator says 328 feet... ).