This is our 5th RCL cruise, we have travelled on Allure, Oasis and a smaller boat. The big ships are so fun, with so many options of things to do for everyone.
We were on expedited check in which took literally the time to walk to the boat. We did not have to wait at all.
The first day on all ships I always find busy, there are so many people walking around confused, trying to find their way etc etc. You just have to know that when you arrive that there may be a few people in the way.
Cabin was more spacious on the symphony vs allure or oasis. The layout was great with the bed closer to the bathroom and couch by the patio. Felt like more than enough room with tons of storage and drawers.
Took the train I think was approx 60 euros for two of us return. Took under an hour by train and Rome was totally worth it.
Did double decker tour. Not the nicest port and should have gone to Pompeii
Lovely city!