Nice and clean parking garage directly under the Hauptbahnhof. 2,50 euro per hour is above average in Berlin, but the first 15 minutes are free.
The exit to Clara-Jaschke-Straße is claustrophobic but fun, as suggested by my video clip.
There is also a smooth but easy-to-miss entrance directly from the Tiergarten tunnel if you come B96 from the south, as well as an exit into the same tunnel from the same deck (the lowest one).
Video link: http://www.youtube.com/watch?v=ppFrqqEzE38 read more