This was our 1 cruise on a Crystal ship and we had heard only good things about Crystal Cruises, but there were also some negative items we did not appreciate at all.
First to the good things: nice ship, good size (below 1'000 PAX), never crowded, excellent food in all restaurants, excellent service and staff. Perfectly organised boarding in Valparaiso and de-boarding in Buenos Aires. Well organised excursions (but VERY expensive but that's the same on other cruise lines). Some of the excursions did not fulfill the expectations, but most of them did.
Negative things:
We were very happy with the cabin. There was plenty of closet and drawer space (considering that next to the 19 day on board we had added another 3 weeks traveling south America thus we had plenty of sloths to be stowed away. Also the bathroom was of very adequate space (plenty of space). Flat bathtub with handles for rough sea.
The one this we were a bit disappointed was the relatively small size of the cabin. For price we paid we had expected a larger cabin (as we were used fro other cruises).