Great location. Within 5 minutes of walking distance you get Higashi Shinjuku Station, and more importantly to the nearest bus stops, which is more convenient if you want to go along the likes of Waseda, Ikebukuro, Shinjuku, or Shibuya. There are multiple convenience stores located all around. A grocery store is located nearby as well. If you want to go bigger, there is also Don Quihote nearby, two if you count the one near Shinjuku Station as well. And off course Kabukicho is practically next door. The selection of restaurants is also great, from Japanese traditionals, Chinese, and even McDonald's just in case.
Not recommended for stays during Winter season. It gets really cold even in the room. There is only an air conditioner for heating. There is no separator between the entrance and the room, which makes it difficult to control the temperature. I had to buy a pair of room wear just to get by. Hot water is very weak. Just don't expect to take a descent hot bath. And in case you didn't realize, there is no automated toilet (the ones that can pour out water to clean you with a push of a button).
Somewhat noisy location. There is a construction going on nearby so the noise can get you, even at night. There are noises coming from ambulance or police cars everyday (night).
Overall, if you care about location, then this place can match any hotels nearby.