We were very happy with this cruise and pleased that we were able to do it on Celebrity because most of their itineraries are pretty boring (that is the only thing they should learn from MSC!).
We were lucky that we were on one of the first cruises after the dry dock "Celebrity Revolution" makeover. The ship - like all M class ships - was in bad need of a renovation and we were overall quite pleased with the results. One exception: the Retreat Lounge had horrible seating and no atmosphere at all. They really have to change the seatbacks of the sofas and the far to uncozy lighting, bring the frosted glass enclosure towards the "Art" Gallery back and kick those ridiculous toddler stools out, not even Kelly Hoppen MBE will be able to get her behind in.
Staff was the best we ever had: everyone was greeting and cheerful.
The suite and the suite makeover were fine apart from the shower that just featured a tiny little glass panel to keep the water in which meant constant flooding of the bathroom floor. They apparently tried to compensate that by limiting the shower pressure (bath tub water pressure coming from the same faucet was great) which resulted in you standing under a lame drizzle and still flooding the floor. Although I am not a fan of shower curtains, here one is badly needed.
Sound insulation towards the neighbouring cabins was not so great. Not sure if that had something to do with the makeover of the walls or if that was a problem before, too.