Just completed my 2nd cruise with Celebrity on the Constellation. It was a last minute booking and we stayed in Cabin 6004 (Ocean View Accessible). Let me start off by saying that my first experience with Celebrity was on the Equinox on a 10 day charter cruise last summer in the Mediterranean in Aqua class and we had an amazing time.
This cruise I would give a B-.
The boat is a good size, but there doesn't seem to be a lot going on. I expected less activities on a 4 day cruise, but most of the boat was a snooze fest. I later realized from other guests that the M class tends to be a quiet ship.
Extremely large Accessible room. Located in the bow of the ship, it's a bit dark and the bathroom is just OK, but at least it's big. Perfect for those needing or wanting extra space.