My wife and I went on the Baltic Cruise with Princess in July 2015. I had mixed feelings about it. We had previously gone on the Alaska cruise with Princess and it was wonderful. The Baltic Cruise was a good way to get a sampling of Scandinavian countries. The stateroom was comfortable, the staff was very helpful and the food, although a bit institutional, was good. Princess also added some live shows with audience participation which were fun.
That said, I do have some constructive comments for Princess (which I sent to Princess and never received a response) and advice for possible passengers.
First, unlike the Alaska cruise, there was no one in the food courts ensuring that passengers washed or used antiseptic on their hands before eating. On the Alaska cruise that was really reassuring. On the Baltic cruise, no one was there to remind people and I noticed about half of the passengers did not clean their hands. I think this is a real health risk.