Grapehouse feels like a place from a tv-show.
All the people were lovely and really helpfull.
The place is nice and clean and feels really safe. You will have a bed with a curtain, little storage space with a lock (for your passport) and some space for your luggage.
Koenji is a triftstore place, so a lot of cheap secondhand clothes. Also places to eat.
Easy to get to shinjuku by train. I also walked, but wouldn't recommend.
I think I will come back to grapehouse one day. Would recommend to anyone!