「The hotel is the top floor of light rail train station “Wannsee” hence is very well connected to the lake as well as to the railway downtown. Don’t expect a luxurious room but it’s clean and very reasonably priced, especially for Berlin. Parking is free between 18:00 and 9:00, otherwise free for an hour with a “Parkscheibe” (the blue thingy that should be in your car), but the spots are scarce. However with luck and good timing you can get a spot, especially in the evening. No breakfast, but...
