For me, I enjoyed 2-3 days of Paris. Any more then that and I wouldn't have been enjoying myself any more. I found it too loud and busy to stay for too long. However, I'm the type that prefers middle-of-nowhere towns in Germany to the big cities of London/Paris. I've been to Europe a couple of times and I find that London is a great way to start a trip. There is a ton to see, yet enough side-street pubs for me to duck into when I need to get away from the traffic for a few hours. It is also smart to have at least 3 or 4 days at the first destination to deal with any jet-lag.
I think a great trip would be 2-4 days in London to start, 2-3 days in Paris, then either a week in Germany or a week in Italy depending on your preference. As long as you don't over-fill your itinerary then it is basically impossible to go wrong no matter what you choose. Two of my favorite countries I've visited were Ireland and Finland, although those don't really seem like honeymoon type destinations.
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