I think you just need the Wohnungsgeberbestätigung from the landlord and fill the registration paperwork at the Bürgeramt (which, depending on your city, might be a bit hard to get an appointment), you might also need to take care of the TV bill stuff.
While not awful, comparing to Portugal, where I just need to register in a website an then wait to get a confirmation code by mail, it feels like going back to the stone age.
While not awful, comparing to Portugal, where I just need to register in a website an then wait to get a confirmation code by mail, it feels like going back to the stone age.