One of the many abundant restaurants in Las Vegas is the Hash House A Go Go, a place where you can eat for less than 10 € per person. The menu is extensive and includes everything from breakfast to main meals of meat or fish. The portions are large, so be careful when ordering because two people can eat perfectly well with one dish.
Open 24 hours a day 7 days a week, Planet Dailies a restaurant that fully satisfies your needs. Breakfast in particular, whether sweet or savory, is exquisite and never-ending. The place combines comfort with a nice design, and is situated inside the Planet Hollywood Hotel and Casino on the main street in Las Vegas.
At the heart of the Cosmopolitan Hotel, next to the great chandelier hall, is Holsteins. This Burger Bar in Mandalay Bay is the world-wide reference in hamburgers, but it's also fashionable. These serve specialty burgers, with premium ingredients, and their prices are in accordance to their quality. I really recommend it, and the shakes are wonderful, simply wonderful! The music was great, though it would be better if it wasn't so loud.