Have to say my 5 days in Berlin was one of the best city breaks I have been on, absolutely loved it there. Also love Amsterdam and pretty much all of the Netherlands.
Brugge was nice but after a couple of days you kind of run out of things to do, but it was lovely as it was the build up to Christmas and looked very Christmassy which was great with a young child. Brussels was a bit ordinary as was Copenhagen, so will not go back there. Prague was great and NYC I have been to 3 times and and I am going back with my 2 youngest children 18 & 15 in February depending on knee operation date.
Next break I want to go to Italy, France or Hungary. Might try and tie in the Tour de France next year, again depending on knee operation date date.