Enjoyed our week at this location. The property is close to everything! Literally around the corner from the Higashi-Shinjuku station, a coffee shop and the nearest combini. About 10 min to Omoide Yokocho if you take the main streets, with a lot of shops along the way. Less than 15 minutes walk to the JR Shinjuku Station and about 20 minutes to the Tokyo Government buildings. Shinjuku Gyoen is pretty close about 1.5 miles away.
Room-wise, this location had everything we needed. The size was perfect for two people. The room was really clean, and they provided a cleaning a few days into our stay. Free water, coffee and tea were a plus. In the lobby they even have complimentary umbrellas for you to use in the case of rain, which I think is really thoughtful considering winter is a pretty rainy season for Japan. I think the only thing that threw my 5'9" husband off was the size of the bathroom - fixtures are a bit smaller and shorter than usual, so showering required a little more bending than he was used to, but I'm pretty sure that's standard for older buildings. This wasn't so much a problem for me, since I'm 5'2".
Staff was super attentive and courteous, with lots of tips for us when we had questions. Thank you, David!