We spent a total of 3 days and 2 nights since we included the cost of the overnight train in our Berlin costs. Here is the breakdown:
€110 :: Accommodation
€108 :: Food + Drinks
€66 :: Tours, Museum, Cruise
With the current and pretty much non fluctuating Euro to USD ratio at $1.35 to €1, the equivalent in dollars is $384.
That ends up being about $64 or €47.33 a day per person. A little higher than our average, but we did splurge a bit on food and accommodation.