searching for a babysitter, for a 4 y/o, Altstadt, Heidelberg

We’re an international family living in the Heidelberg Altstadt. We are searching for a babysitter (speaking both English and German) for our 4 year old daughter. Ideally the babysitter will be available 1-2 evenings a week for a couple of hours (post 1730), and occasionally for bedtime and for longer periods (usually 1-2 times a month). Our daughter loves being outdoors, music, reading, is curious about learning new things. Preference for people with childcare experience (such as working in a kindergarten).