Just came back from a July 1st-July10th Baltic cruise roundtrip from Copenhagen on the Norwegian Sun! Since reading cruise critic reviews was instrumental in helping me prepare for my trip, I thought I would take a shot at helping everyone else out there prepare for this trip of a lifetime!
A few disclaimers - I am 23 years old and American, so some of my thoughts are colored by the perspectives of age and nationality!
Embarkation and Disembarkation: Embarkation, as most people have said, was very smooth. My parents and I arrived in Copenhagen the morning of sailing and spent a few hours around the city. We took a public bus to the port and everything was a breeze from there! We went had lunch in the Seven Seas main dining room, took a self-guided tour around the ship, and found our luggage waiting for us when we were ready for it.
Great location and great water pressure in the bathroom, even if the bathroom was a bit small.