I stayed at the apartment for two weeks and really enjoyed my stay. Koenji is a cool neighborhood with lots of small bars and restaurants open well into the night. Great for thrift store shopping as well. The place is clean and comfortable for 2-3 people. Plus, you are just several blocks away from the metro and can be in Shinjuku in no time. My only comment is that the wifi is a bit irregular and would often drop out - so I recommend bringing an alternative internet source if you need to use videostreaming or other high-data work during your stay.