Hi Sarah,
I go to the
TG Bornheim they have many different step courses and a bargain at only 9€ a month. You can see the programme under the tab 'Belegplan'
I do not think you really need to be able to speak German I mean the explanations are reasonably basic 'links' 'rechts' etc and the words for the different steps are the same in English.
I normally go on Monday and Friday at 18:00 and would be happy to have a bit of company. I have been known to go other days too though.
Let me know