I spent some time dithering over choices for a 5-night stay in Tokyo prior to embarking a cruise there, and considered several other hotels before deciding on the Grand Arc Hanzomon, largely on the basis of the TripAdvisor reviews. What a good choice it turned out to be. First, by Tokyo standards the price is very reasonable, and the rooms are both spacious and stylish: great care seems to have been taken in furnishings. Beds are firm and comfortable, with linen changed every day by the most courteous housekeepers. Almost all rooms overlook the Imperial Palace Gardens; rooms have huge windows to allow you to enjoy the views. Bathrooms are not large but are adequate, and come equipped with an all-singing, all-dancing Japanese toilet: if you don't know what this is, you're in for a surprise.
The Grand Arc Hanzomon is not right in the centre of frenetic Tokyo, but to me that was an advantage: it is two minutes' walk from Hanzomon Metro stop on the Hanzomon Line, so Ginza or the other major centres are no more than 15 or 20 minutes away.
Staff are uniformly extremely courteous and helpful, as only the Japanese can be, although in some instances I encountered a language barrier with restaurant staff, whose command of English was rudimentary.
I felt that breakfast was the weak link in an otherwise perfect stay: it is rather unimaginative and limited, but I have to admit that there are plenty of places nearby where one can get breakfast.
The Grand Arc Hanzomon is not a "grand" hotel in the style of the Imperial, the Okura or the New Otani, but those hotels have the disadvantage that they are swarming with people and are often confusing in layout (the New Otani especially). I like the restrained atmosphere at the Hanzomon, although it can be busy at weekends when it becomes a popular venue for weddings.
All in all, I am delighted to have found this hotel, and will be very happy to return there on my next visit to Tokyo.
Higher floors have better views (naturally).
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.