Great place in the middle of Shinjuku. Like the description said, it can be defined noisy at night, but I realized with the door to the balcony closed, it seems almost peaceful.
The apartment was clean and cozy and the balcony is pretty cool for a nice night to hear the hustle and bustle below.
The neighborhood is not for everyone, which Ken definitely mentions. If you want a quieter, chill neighborhood, this place would not be for you. But if you enjoy being close to a bustling night life with a lot of food, bars and "other" kinds of bars within meters, this place is for you!
I must mention, it is pretty easy to get to other parts of Tokyo from there, considering the metro is about a 5 minute walk from Ken's place. :)