We were on the Celebrity Constellation on the November 4, 2015 transatlantic crossing.
Check-in was quick, efficient and well handled. We were impressed with the speed in which we were able to check in and board the ship. I should note at this point that this was our second time leaving from Civitavecchia on a Celebrity ship and both times it was a quick and smooth process.
Bar service was quite often slow, particularly in the casino.
Our room was a family veranda cabin (9156) and it was excellent. It was spacious, clean and well maintained so we were quite happy with the room. Our two cabin attendants were excellent and the room was always clean. The balcony on this room is very large and we enjoyed sitting out in the evenings and just watching the wake of the ship. There had been cabin reviews that indicated that we would be able to hear the scrapping of chairs from the restaurant/bar on the deck just above the room. Indeed we did hear the sound of chairs moving/people talking etc. early in the morning and into the evening. It was of little consequence to us. The size of the balcony more than made up for any noise and we were really happy with all aspects of the room and balcony.
We have been to Rome a number of times. It is always amazing to visit. Loads of things to see and do so one never runs out of options.
Walked off the ship. Easy port for a walk off. We engaged in a nice selection of sightseeing and shopping.