My one and only experience with Druen was part of a big group and my experience was so bad I always go out of my to not recommend the place. The service and food was soo bad that Norwegians were sending it back. And that is pretty extreme for Norwegians as they NEVER complain about service. We were like 30 people and with prearranged dishes and they still managed to take almost 2 hours to prepare our main course and then half the dishes had obviously been made over an hour ago since the sauce had gone all stiff. The waiters were sourly and even managed to loose a used fork down one of the guests sweaters without as much as an apology. I remember I ordered nacho chips with dip as a starter and dumping handfull of chips into a bowl and some dip onto smaller bowls took over an hour, and at that point they were already serving the main dish...
There is a restaurant at Bryggetorget with a slightly danish sounding name which I have a lovely experience with. Good food, expert waiters and a good feel at the place. Can't remember what it was called though.

Cobos