I used to live in Koenji and came back for a visit. Choco’s place is clean, comfortable, and conveniently located. It’s close to all the action while still being on a quiet residential street. You’re barely 4 minutes from the station, too. — On top of this Choco and Aiko are very helpful! I arrived in the middle of the biggest snowstorm in Tokyo in 4 years and they were kind enough to check in and make sure I was safe and made it to the apartment okay. They are definitely a good resource if you are new to Tokyo!
Koenji is a funky retro haven and full of the most chill people you will ever meet in Tokyo. Definitely recommend staying in this neighborhood if you don’t know it! It’s also very close to Shinjuku, so you’re still connected to the biggest station in the world.
I highly recommend going to El Portego, which is only a 3-4 minute walk south from Choco’s place. Ask for Taka and tell them Gina sent you. They’ll definitely have great advice about Koenji!