Babysitter Job in Darmstadt

I am a musician performing at the Darmstadt Ferienkurse and looking for someone to watch my children on my concert day (rehearsals and concert). They are 6.5 and 3.5 and love each other very much. They are social and adventurous and fun to be around. Looking for someone who would be comfortable taking them around town in the afternoon and putting them to bed in our hotel in the evening.