If you arrive at Wilhelmshoehe, the simplest is to tke the tram to "Querallee" and then walk. The best line probably is TRAM 4, which starts in front of the trainstation. You get off at "Querallee" after about 6 min tram ride. The Youth Hostel is then a 500 m walk away (along Querallee/ Schenkendorfstrasse).
Link to the time table fo tram 4: https://www.kvg.de/fileadmin/kvg/Dokumente/Plaene/Fahrplan/Tram/2024/04.pdf
Map of the area: https://www.openstreetmap.org/?mlat=51.3193&mlon=9.4758#map=15/51.3193/9.4758
