I recently spent a few nights at Dellago and I hope to return soon. I was a little worried due to some of the reviews that I read, but I was pleasantly surprised upon arrival.
Check in was quick and easy - within minutes were were unpacking in our room in the building across from the main. The room was exactly what it promised to be. Yes, there was maybe a spot of two that could have been touched up with paint, but seriously there are much better things to be doing than walk around the room and look for issues. Also, despite the room being above a road, the noise was minimal. Actually, the only issue we really had was the Television/DVD/2:1 surround System, but it really didn't matter.
The view was spectacular and the room very comfortable. Breakfast was amazing with a great selection! Be sure to eat at the restaurant while you are there - the food and the view are amazing. And check out the gourment store across from the mail building.