How and where to learn Indonesian
I can really recommend Pimsleur. It’s nice to listen to it at night and learn the basics well.
Universities in Germany
Heidelberg University offers basic Indonesian course by the knowledgable Dr. Lany Probojo. Two Courses (each 5ECTS) are offered, rather basic with few students
Goethe University Frankfurt offers a Master in Southeast Asian Studies with a great focus on language. Indonesian classes are offered in four different levels (2 hours a week) in German by Nothofer, Bernd.
The SOAS of University of London offers part-time Indonesian courses.