I have just eaten at this place. It is averagely much more expensive of what you should pay in Hanoi (even management know this as to the menu price you need to add 10% extra for taxes), however here I should consider a very nice view opportunity. (4th floor in front of the famous lake with the temple).
I ordered sushi, it was very good, service as well. I would consider this as a great place for a business meal.