We had a great time. It was only 5 days which is all the time we had.
We spend an additional day in Copenhagen which I would recommend. The canal cruise was very interesting and well priced. It is worth wile to pay for a guided tour with only 5-10 people rather than the free city tours.
The Serenade although older was very clean. The staff was the highlight. They were so friendly and amazing to live with for the week. They remember our names and what we liked. The entertainment was a good variety of music, dance, along with a BMX entertainer.
The cabin was very nice. The ship is older but the room was good.
The attendant was amazing, so friendly and willing to help us with anything we needed