Based on Web research I visited Rosemary's this past week when in Vegas for a birthday rest and relaxation trip. It is indeed in an unlikely location but the decor is upscale and pleasing to the eye yet very soothing.
Their three course fixed price lunch is a bargain at $28.00 but I had a Web promo printed out that brought the price down to $23. Absolutely an outstanding bargain at either price.
Ordered a salad with arugula, poached pears, nuts and blue cheese - outstanding. Entree was duck confit with lentils. It was not rendered for long enough and thus was a bit fattier than it should have been and wasn't quite at the optimal pull-apart stringy texture that marks a great confit but still very tasty. Dessert was a flourless chocolate torte - very good but IMHO served a bit too cold.
Service was from an attentive young staff - obviously well trained and eager (almost to eager) to please. I likea slightly more subdued presence that is nearly invisible but from an overall standpoint I still have to give them high marks for service.
I'm very picky about food and have eaten in some very good restaurants on my travels. I can safely recommend Rosemary's to anyone who is serious about food and service and has high expectations. They are obviously very committed to a high level of service and focused on both the quality of food and the presentation. It's worth the effort required to get there if you're in Vegas.