Marianne,
We have those exact two rooms booked for our Western cruise next May. We'll be in one room and my in-laws in the next.
Since I haven't been in the rooms yet I can't speak from experience, but I can tell you we booked them by how much we loved our Navigator veranda room on the Wonder.
Here's a few of the reasons we loved it:
* The Navigator veranda has a padded bench and a padded chair instead of two regular chairs. A great place to stretch out and read which I like to do on the veranda.
* Since the veranda is enclosed a little more it is a bit more private and also blocks the wind a bit more. The opening on the Wonder is very large and oval. I know the one on the Magic will be round and bit smaller but I think it will be just as nice.
* Since you are in the aft you get to do the safety drill sitting down in Anaimator's Palate instead of standing out on the hot deck!
* You can take the back staircase right up to Topsiders for a quick breakfast or lunch (we even filled up a tray and brought it back to our room one morning to eat on the veranda).
* Since you are past the main stairs there isn't a lot of hall traffic so it seemed pretty quiet most of the time.
When we have shared rooms with an open door in the past we have always done it by keeping it open most of the day, but then shutting it at night. It was agreed that when each party was ready for the day they would open it up. Worked out great for us.
Enjoy! And please report back on how you liked the rooms when you cruise.