We stayed twice in this hotel, with our 2kids of 9 & 11 years old, first in a std room with beds, and in a Deluxe twin room still western style, at the end of our long travelling in Japan in July 2013. The difference in confort and size of room is really worth the difference in price we got on the deals via booking.com. the std room (110 € per night) was actually very tiny for us 4 and all suitcases. The Deluxe room at 160€per night had a nice sitting room space in addition to the 2 beds and splendid bathroom and separate toilet. 2 large windows with a view on the green imperial gardens... Waouw ! Nearly a studio. For Tokyo, this hotel is really a nice quiet and 4 stars confort and services place, at very decent price. Indeed night life is at a few stops of metro from there, but not a big deal compared to the advantages detailed above.
Good tip for travellers : most twin room in Japan (sold on internet for 2 adults & 2 children) have quite narrow beds. Usually between 110 and 120cm : to know before booking for a family with children or tall teenagers... This hotel has beds of 120cm wide, which was OK for our family.