We were actually on the "European Sojourn" itinerary, not just the "Passage to Eastern Europe".
We flew into Bucharest, went to a beautiful hotel, and started our regimen of taking COVID tests by spitting into small tubes. Everyone wore masks on buses, in the hotel, and tours. As we all know, however, we can't wear masks while eating or sleeping. More on this later...
I didn't take the pre-trip extension but talking with several people who did it was very interesting and worth the time. They encountered snow in Transylvania, a surprise to some!