I will strongly recommend 静’s place to stay. The location was amazing in a small street away from the Higashi-shinjuku station. It allowed easy access to Shinjuku, Shibuya and Harajuku etc.
The accomodation was accessed through pinpad and was quite clean & modern. One double bed was available along with a futon bed, we travelled as three adults.
We were staying in level 1, so one flaw of the place was hearing people walking and talking on the streets early morning quite loudly (not so much late at night). Perhaps higher levels weren’t affected as much?
Overall, this was an enjoyable stay. Very happy.