I think the only downside for this place is that it is too small for its max capacity. We booked for 6 pax but only 4 of us went on the trip and the place still felt cramped (given they set up bed for 6 pax). However, i read most Tokyo accommodations are of this size so we made do with what we have.
On the flipside, subway line near the place (Yotsuya-sanchome Stn) directly connects you to Tokyo Stn, Ginza, & Shinjuku. Location of this place is 11/10. I also walked to Shinjuku Gyoen garden everyday during my trip for cherry blossoms.
There’s also a lot of local restaurants & convenience stores near the place. It is situated in a quiet neighborhood so you will surely get a peaceful sleep at night.
Overall, a good stay.