The place is in a quite area in a good neighbourhood. There are convenience and food stores from the railway station to the apartment very convenient to pick up the next morning breakfast. The apartment is reasonably spacious considering that is Tokyo: it can accommodate easily 4 persons but no more.
Instructions and check in are very clear.
Consider that if you have to take the railway to reach the apartment and therefore you need to pay extra (~2 euro pp) every day if you have only the metro subscription.
All in all a good place I would recommend