The Restaurant at Ambassador Hotel
The restaurant at Hotel Ambassador is mentioned by professionals. Out of 6 reviews tracked on TripExpert, 3 acknowledged the restaurant, like Frommer's, Lonely Planet and Star Service.
Ambassador Hotel 
Frommer's
Lonely Planet
Star Service
Frommer's "The restaurant, Léhar, serves high-quality Austrian and international cuisine"
Lonely Planet "Its gourmet restaurant Mörwald im Ambassador is a Vienna treat, making this a wonderful choice for weekend breaks"
Star Service "The restaurant breaks the mold here, carving its modern niche out of a corner plot"
