Such a good location! On the sweetest little quiet street but near everything (train, groceries, coffee, food, park). We stayed with 6 and a baby and it was a little on the cramped side since we had to use the living room as a bedroom but it worked ok because the kitchen and shower are on a different floor so was easy to hang out without waking everyone up (omg toddlers with jet lag, not the business). Beds are really comfy and there is actually a decent amount of storage for luggage and such. Only negative is the stairs are slightly treacherous with a toddler but we got him to the point where he knew he needed to ask to go up or down.
Derek was very easy to work with and responsive! Overall, a lovely spot from which to explore the amazingness of Tokyo!