Great location! It’s roughly a 5 minute walk from Shinjuku Gyoen Station and 15 minutes from Shinjuku Station. Note: there is no elevator in the building (at least that we could find/access) - carrying our stuff to our room wasn’t an issue but could be problematic for persons with limited mobility.
The space is modern and roomy (by Tokyo studio standards) with a private washer and pocket WiFi.
Ryota and the Zens Team (listing management team) were quick to respond and easy to communicate with. They provide an excellent guide (via google doc, super convenient for offline access) to getting to the apartment and a step by step guide for using the utilities/amenities in the apartment. Excellent place to stay if you want to explore the Shinjuku area!