"One of the best in terms of Sustainability"
Copemhagen is a city I return to over and over and its a joy to see how fast they adapt to the sustainability challenge in all fields. Biking is one example, Copenhagen has transformed itself to one of the best biking cities in the world. It's also very easy to be a pedestrian, public transport just a got a huge boost with a new metro line. Go there as soon as you can, winter is always special with the Christmas market at Tivoli.