The city has been our home for more than 9 years now. And even though it is a small city for beeing a European capital, it is an extremely dynamic place with lots of stuff going on in arts, architecture, music and food. But, what makes it really special, compared to other cities, is the fact that you are out in the nature and back again within half an hour. Skiing, biking, hiking... everything is around the corner.
So, it is the perfect place for urban nature-lovers :-)
The City of Oslo has a brilliant webpage with loads of useful information. Also good stuff for day trips outside the city.