Amazing location - Koenji is a great place to be and you can come and go very easily 24hours from Top Edge. This hostel is very clean and everything feels new.
I highly recommend if you're not a fussy sleeper: no curtains on windows or beds and loud hot water tank in the girls room, so make sure you have an eye mask and earplugs and don't mind hard beds and tiny pillows.
Nice touches like power points in the bunks, open door 24 hours and lots of toilets were great.