6 week western europe tour advice

[stunnnna]

Well I am back again for more advice my trip was postponed but now is finally going to happen!!
I am looking at traveling western europe for around 6 weeks from middle of april until end of may. I have cut down my initial plan by a few cities in order to make it more managable and enjoyable hopefully.
Here is what it looks like now

Day 1-3: London
Day 4-8: Paris (daytrip to Caen)
Day 9-11: Nice
Day 12-14: Milan (this is one thing i am questioning not sure if it would be better spent elsewhere possibly cinque terre any suggestions??? Just have heard mixed things on Milan)
Day 15-18: Rome
Day 19-20: Florence
Day 21-23: Venice
Day 24-25: Vienna
Day 26-29: Munich
Day 30-32: Berlin
Day 33-36: Amsterdam
Day 37-39: Bruges
Day 40-42: London (not really 6 full days with travelling and such)

I am really open to any suggestions about the itinerary, must see places in those cities or must do day trips as well as any good hostels!!!!
Thanks for all the help.
Cheers!