yeah I am moving there this time, living in Azabu. Last time I went I tried the Conrad instead, better rate. Wasn't bad, the in-house Japanese restaurant and bonus services were good.
I bought this year's Michelin guide recently, there's a fuckton of restuarants in Minato, so if you're there to eat (which you probably should, since the yen is gonna preclude any jawn buying) you should stay around Roppongi somewhere. Every other restaurant in the Michelin guide is somewhere within close walking distance to Roppongi Hills, so it's a decent base of operations.
The yen is so strong though, I'd forget about Japan and just go to Europe this year, come back to Japan next year if the yen has reached anywhere near 90/$1.