Would absolutely agree with this. Anywhere to anywhere in the main 5 wards is a piece of cake to walk. It really gives a great perspective of the city also. And it is very safe.
I'm not entirely sure I'd go with that. From Womb Lounge in Shibuya to the Mandarin Oriental Toyko is a longer walk than from Washington Heights to the Mandarin Oriental New York; and a much less obvious one.
I'd be impressed if anyone in a state of inebriation managed it in less than about three hours!