My husband and I are in our late 40's/50's. We were looking for a quiet getaway - to read and relax and found it on the Zaandam. A small ship by new standards, but the best service from the cabin steward and dining staff that we have experienced in our 15 cruises. And by far, the best food. Of particular high quality were the beef entrees and the soups. I wasn't thrilled with the desserts other than bread pudding and banana's foster.
As I said, the ship is small, and doesn't have all the amenities as the larger newer ships, but if you want a higher standard, a high quality passenger, a relaxing atmosphere then this will be great. If you are looking for party atmosphere, don't go here, as you will be disappointed.
We still can't get over the quality of service. Everyone we encountered was absolutely top notch. I don't know how they do it, but my husband and I commented on it daily.