Erasmus student looking for a one room appartment

My name is Roxane Atchekzai, I'm 22, I'm an erasmus student from France.This year I will study at the university of Bonn in its master of mathematics from October 2017 to August 2018.
That's why, I'm looking for a one room furnished appartment not too far from the university in Endenicher Allee, in a place well served by public transportation. The daily transit trip to the university must take less than 40 minutes.
I can move in by the end of September.
The all-inclusive rent has to cost less than 600 euros monthly. My parents will guarantee payment of the rent and the rental security.
I'm well- organised, tidy and careful. I like reading, going to the cinema, visiting museums, jogging and cooking. I may have to sometimes go back to the appartment a bit late in the evening for example 10 p.m. - 11 p.m so I would prefer an appartment in a quiet and safe place.