Advice Berlin to Copenhagen: Train, Bus, and Ferry Route?

[TrailWhispererZ]

Hey everyone, I'm planning a trip from Berlin to Copenhagen and looking into the logistics. I found a connection that involves taking a train to Rostock Hbf, then walking to the Flixbus stop, which takes a ferry to Gedser before heading to Copenhagen. Has anyone done this route? How's the transfer from the train to the bus? Any tips on timing or what to expect on the ferry? Your insights would be super helpful!