Currently staying here on points as a PM, and enjoying the stay. The traffic noise is noticeable even from the sixth floor but I have a cool view of Berlin as I was upgraded to a view room (normally 20 Euro extra, a better benefit than most Hyatt's give me). Came back to my room today for my last night and noticed some chocolates awaiting me, nice touch. Wish I could stay here for my final night in Berlin but I scored too good of a rate at the Novotel Tiegarten (50 E thanks to my A-Club Gold status). I plan to come back to Berlin and plan to stay at the Grand Hyatt again when I do. One minor complaint is that there is only one bar of soap in the bathroom, should be at least two or three.