25 yo male, looking for single apartment in Jena, Thueringia, Germany

I am about to move to Jena for three years Sep 2019-Sep 2022 for a PhD at the Max Planck Institute for the Science of Human History (MPISHH). The PhD is in association with the FS University, Jena. 

I am looking for any single apartment with a kitchen, bathroom. The building or the apartment should have laundry facilities. I'd like an apartment in the city centre or Jena West, walking distance to the FSU Jena or Max Planck Institute for the Science of Human History.