Gotte, I can pretty much guarentee you will NOT be allowed to take your bike to your room. Bikes don't belong in bedrooms. I am, however, pretty sure that there will be someplace you can safely lock your bike. Like their garage, or a storage room in the basement, or something along those lines.
German B&B's won't even let you walk in with your shoes on if their muddy!
And rightly so!