We recently sailed from Rome to Athens on board the Crystal Serenity. We had a good trip overall, and it has to be said that the Serenity is a handsome ship- if larger than our normal choice of ship.
Although we normally prefer smaller ships like Silversea, we had travelled once before on the Crystal Symphony, so we knew what to expect from Crystal, and overall our experience was consistent.
One area where Crystal excels seems to be in transfers, embarkation and ground arrangements. The embarkation process was very smooth with Crystal staff easy to identify in the baggage hall of Fiumicino airport.