The service was excellent, the guy running the non-smoking section (at least, on weekdays) has one of the best attitudes for a waiter I've seen in Vienna. The food was good, not great. Don't hold back and order your steaks rare - medium-rare won't get you the blood. The fries were too salty, but apart from that I had no complaints.
The non-smoking section is a courtyard lit by daylight (it didn't used to be part of the restaurant proper). I personally prefer the interior, looks-wise, and their air conditioning, is quite good so you can hardly tell it's the smoking section. I may sit there next time.
I forgot to mention they do excellent Thanksgiving dinners, both on Thanksgiving Thursday and on the Friday after that.