I would buy a 5 day unlimited use pass at the Bahnhofplatz location across the street from the Westbahnhof.
At the Bahnhofplatz location, to get to the main computing floor, go to the back wall and down the stairs.
The street level is always full of people using the computers. Downstairs was usually quiet.
You can buy 1/2 hour, hourly passes at the going rate at the time you buy them (prices vary somewhat during the day.) Or you can buy 24 hour, 5 day, 7 day passes up to 30 days.
The service is very easy to use and in many of the locations there are food services offered. At the Bahnhofplatz location there is a McDonalds restaurant.


