That appartment not far from station. Also it's good location to acess all the popular places in Tokyo. Lot of stores, cafes and 100yen shop close to it. Haruko provide us with pocket Wi-Fi, so great thanks to him for that! It really helps. Before come please clarify about key, nothing special, but just ask about it.
In general it's good place to stay. Not sure about kids, but actually it depends on kids)))