We've cruised with different cruise lines and on this occasion we were taking the in laws for their first cruise. They specifically wanted to go to the Vatican so a trip round the Med ended up being the obvious solution. As they weren't sure that cruising would be their thing, we booked the Harmony of the Seas on the basis that if you might only be going once, might as well go big!
The ship is magnificent. Its size and scale is truly is something to see. Very stable, quiet and admittedly, we had good weather/sea conditions but you could hardly tell we were moving. Cabins were large and the showers huge by cruise ship standards. We were very comfortable. The boulevard and Central Park are great spaces to wander through and the Aqua theatre unique. It's a fairly new ship but kept pretty immaculate.
We found the food overall to be very good and the staff that attended to us (waiting staff Martin and Maricar and stateroom attendant Shri) were excellent.....couldn't fault them.
Great. Large shower, comfy bed....no issues here.
We wandered into town but didn't see much/anything and thought it was a waste of time.
Take the train. Only €10 return to Rome. Peanuts compared to organised excursions. Just be aware that platforms 24-28 at Rome Termini are a long walk from the main concourse and you'll need to allow at least 10 minutes to walk to the train.
Took port bus into centre and really liked Marseille. Glad we went.
Been to Pompeii before and loved it.
Nice. Great market on a Sunday.