Have been on several Crystal cruises before, always on the Symphony. First time on the Serenity, first time in each of these ports (Rome, Florence/Pisa, Nice, Barcelona, Ibiza, Monte Carlo).
I can't say enough about the service on Crystal: not overly fussy, but always attentive, and very personal. The crew seems to love their work, and enjoy working with each other, which makes a pleasant experience all around.
There is always so much to do on board: art lessons, bridge classes, enrichment talks, movies, golf lessons. The food in every restaurant is superb.
Cabins are comfortable -- we've been on Regent cruises a few times, and their cabins are spectacular. Crystal's cabins are still very nice, though!
A wide variety of Crystal-backed excursions, each with in-depth and accurate descriptions. We did some excursions, and also did some exploring on our own. Every port was lovely, and we enjoyed every single adventure.
Crystal's customer service and attention to detail is superb. Here's a perfect example: we were tendered in Monte Carlo, requiring the use of the life boats to shuttle folks in and out of the port. In the early afternoon, the wind and rough waters caused a temporary halt to the shuttles, for about 2 hours -- for safety reasons. When we finally got on board the ship, the Captain and about 10 crew men were there to assist, and we were immediately told that Crystal was putting a $50 per person credit into our onboard account, as an apology for missing lunch on board the ship. Everyone who was delayed received the same credit -- without even asking for it! That type of customer care is amazing -- and it builds loyalty.
Good location, good size. Wonderful cabin attendant!