Rather than a full review, I'm going to note some things I would have liked to know before I went. We usually avoid ship excursions, so I'll have some comments on what we did.
Bring binoculars (we did to that). Shipping is heavy in the Baltic, and there are lots of interesting things to see. We were docked next to the HMS Illustrious in Tallinn, and passed a surfaced submarine on the way to Oslo, for example. Binoculars brought lots of things into view.
The lounge to the rear of deck 18 is usually quiet during the day, with great views and no music (during the day).
Our cabin was great. The stateroom is aft, a short walk from the pool at the end, which is adult only. It was directly below the cafeteria on deck 15, making a quick trip up for a cup of coffee for my wife in the morning easy. There was no noise from the public space directly above.