This Denny's is very convenient to the Monte Carlo and the MGM Grand Hotels. It is open 24 hours and has no big problems. Sometimes the wait is long, so get there early. The music is often too LOUD. The waiters are friendly and as efficient as feasible in light of their work load. Its food is ok, but it is not a fine dining experience, of course.
I have eaten there many times and expect to do so again on my next visit to Las Vegas.