Very close to Higashi Shinjuku station, also bout 15mins walk to Shinjuku station. There are convenience store nearby as well. Very easy to check in/check out with the instructions.
Very spacious room, got a row of clothes hanger along the aircon unit, keeps clothes warm. Down side would be the bathroom and toilet are super cold during winter. The toilet has a sewer smell. The water heater is awesome. Very fast to get hot water.
Overall the stay was comfortable, the rooms are not very soundproof by the way. Would stay again for convenience.