The location in Yotsuya is as near perfect as could be. Close to Yotsuya Station, which takes you to many popular locations in Tokyo with ease.
We got an upgrade because of a double-booking, and the room was bigger, with bigger bed and a bigger sofa. Nice view of the Tokyo skyline. There is a FamiMa right next to the hotel and several other restaurants, cafes and shops. Very practical hotel, I would recommend it easily to friends visiting Tokyo on a vacation especially!
PS. The shower was kind of powerless, very soft pressure. Bring more hangers, as the number of hangers is too few for a long stay.