Great location, less than a minute walk to Higashi-Shinjuku station B1 exit (no elevator) or few minutes walk to B2 exit (with elevator). The room was clean and spacious for us 2 adults with a toddler. The host is thoughtful and I like the nearby restaurants that he recommended.
The only bad thing about this unit is that it's at 2nd floor and the building has no lift, which was a problem for us as we have heavy luggages and stroller.