The location for Sirbu is stunning - you are surrounded by the Viennese vineyards with superb views down on Vienna and the Danube. We have been visiting this place for many years as it makes for a great stop when walking down from Kahlenberg to Nussdorf. Our last visit though was really disappointing. The service was SO unfriendly - you really got the impression they couldn't care less - there was a real risk of dehydration! A great shame and it might be a while before we return. The food was fine without being great and most importantly the heurigen wine was good. If you are walking down the Kahlenberg it is worth sticking your nose in but not worth a special journey anymore.