I know there is a similar thread which I'm watching with interest but didn't want to hijack it! I'm also looking to arrange a weekend away in December for a significant birthday, shortlist in OP (as places DH has always wanted to go).
I guess weather (cold) wise they'll be about the same? Would be interested in knowing which had most to offer if it really is bitterly cold/wet - although we wouldn't want to spend lots of time in museums. Wouldn't go anywhere just for Christmas markets, more to have a swift look round the city and enjoy relaxing in cafes/bars etc
Thanks.