24 years old opera student girl looking for an accommodation for 1 month

Hi! I'm in a search of a place to stay in Berlin from 30 to 29th of September. I am a classically trained musician( singer and pianist) and coming for auditioning and other cultural affairs. I am a nice, a bit old-fashioned person, don't like noisy parties and big companies, so I need a  safe, clean and silent room in order to have a good rest after my busy days. The location should be centre or not far from it ( not outside the city),ideally Charlottenburg area . No drinking or smoking, not going to bring any pets or friends with me:)

All the best, I will wait!