Valdy,
Congratulations on your upcoming marriage.
I am booked on the Grand for the same cruise July 3, 2006. Cannot wait.
I have cruised only with Princess since 1996.
Taking 2-3 cruises per year.
The age range on a Princess cruise can vary greatly. From younger couples your age to older, retired & then small children.
Generally, the longer the cruise, the older the passengers.
Just returned from doing the Baltic (on the Star) & there were loads of children on board.
As far as the romantic atmosphere, you'll have it for sure. How much better than Venice can you get???
The balcony is an absolute must for this cruise.
There is always so much to see & do on a cruise. OR have private honeymoon time.
Good Luck with your planning.
Cathy