Very comfortable, clean place and a great system between appartment and hotel. the fact that you can cook and store in a fridge is quite appreciable if you plan a long stay. Nearby there is a big supermarket and lots of konbinis and restaurants.The place is very quiet and people are nice.
Just two issues : first, the loud traffic on the road which can be heard during the night (maybe it dépends from the location of the room) and the distance from Tokyo center.