This was a very nice stay at Hiro's place. Think studio apartment with 4 full sized beds. The layout was interesting but worked beautifully: shower-sink-clothes washer in one room, kitchen sink in another nook, and toilet in a closet sized space. If someone was using the restroom, someone else could shower. This was fine for our family of 4. There was self check-in. The place is on the 3rd floor, so be prepared to carry your luggage up stairs.
The location was very good. A few blocks from the Yoyogi station. Some nice local restaurants and Lawson's convenience store nearby. There was also a Maruman grocery store (think Trader Joe's) across the street with bento boxes and other prepared foods.
Nice place, great location.