Everything about this place is perfect. Clean, new, location is good (at west side), and it is near to famous ramen shops, pharmacies, and post office.
Of course, a little walking need to be done (about 10-15 mins) to get to the Shinjuku station. It is closer to Nishi-Shinjuku station though.
Bed is huge for 2 people and comes with a sofa bed too. Washing machine is provided and the bathroom is quite spacious too compare to some hotels.
Midori-san is sweet and quite quick in response too.
The only negative I have is the WIFI pocket. It broke down on my last 2 days in Shinjuku, and it couldn't be replaced on time. It runs out of juice quickly too. As a result, I need to use my roaming service.
Internet is crucial for travellers, so my advice is to rent a pocket WIFI from a 3rd party online, or get a SIM card. Don't fully rely on the home pocket WIFI, as I found it not too reliable.
Overall, I would stay there if I am back in Shinjuku again!