What an awesome spot. A short little morning walk from the hanzamon and Shinjuku lines that can take you most places you want to go. The neighborhood to the west is very eclectic and has cute little coffee shops nearby too. It may seem a bit far from the city but the public transit being so close made it no problem to get around.
The rooms were great, we went in winter and it was heated. The hot showers at the end of the day were awesome too (they even have a bath). As a minimalist I really appreciate the tiny living space, they have it set up so nice and cozy. The restaurant owner on the bottom floor shared sake with us for the new year and he was so friendly every day.
Id highly recommend this place to stay, if I don't have to think about my amenities on a trip I usually give a good rating but coming back here each night truly felt like coming home. My partner even slipped a few times asking "do you want to go home" (meaning the hotel).
Tl;dr accessible, clean, warm(for the winter) and friendly.