You're welcome.
Correct. Depending on how long you'll be staying in Germany, the weekly flatrate for € 12.95/7 days might be a cheaper alternative. By handset usage you will never ever exceed that 1 GB within a week.
Remember to create a new data connection profile for WebSessions with "event.vodafone.de" as APN.
Details on WebSessions are available at
Germany - Vodafone Web Sessions - Prepaid Wireless Internet Access