Please Review our Europe Itinerary?

You can still squish in Berlin. 4 nights in Paris are enough. Bruges is a small town that you can see in one day, so 2 nights are more than enough. I haven't been to Amsterdam, but I don't think you need 4 nights there, 3 nights will be enough. Vienna is also doable in 2 nights. That would give 4 nights in Berlin.