Found Holsteins on Yelp--and gave it a go for lunch!  I LOVE burgers--and this place was pretty good. \n\nThe Cosmopolitan hotel is an upscale establishment located in the new City Center development.  We were staying at the Belllagio, and the Cosmpolitan was right next door.\n\nThe restaurant is located on the second floor.  It was a bit loud and chaotic when we got there--which is probably to be expected on a busy Friday in Vegas.\n\nI started with the Cereal Bowl--an incredible vanilla milkshake with vanilla vodka and CAPTAIN CRUNCH mixed in--awesome--though not super potent from an alcohol standpoint.\n\nI had the Hen House burger--which is a burger with bacon and fried egg on top, and I added American cheese.  The burger was fantastic, cooked to order, and served with seasoned steak fries which were a bit dull compared with the rest of the food (you can order shoestring fries instead).  As said in another review--the juiciness of the burger definitely soaked the bottom bun making it a bit unappetizing.\n\nFrom a service standpoint we were seated immediately, and then there was some confusion as one server took our drink order--which took about 10 minutes to fill, and another server then took over.   After that the server was quite attentive despite being very busy.\n\nThough not a cheap restaurant--Holsteins was reasonably priced for this part of the strip.  The ambience was fun and bright, and I would definitely return for the shake!