I would recommend this hotel to the first time visitors to Tokyo - prime location in Hibiya, convenient access to subways, clean rooms (as are most of hotels in Japan.) For me, this is NOT a 'boutique' hotel but an overpriced fancy 'business' hotel ran by a big hotel chain based in Kansai (Hankyu Hanshin Daiichi Hotel). Yes, the decor may be modern and posh but if you look closely it has no character. For 13000 yen for a single room with no breakfast, this is no value. Having a 'porn channels' guide on the bedside was a big turn-off (although it is common at business hotels in Japan.) There is Muji-Cafe at the reception level which is a plus but there is no computer with the internet access. I would recommend Toyoko-inn Tameike Sanno or Keio Presso Inn Otemachi - within a few subway stops away you get the same if not better service for a half price (6800 yen with free breakfast).
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