I have been there several times and the Magic Mushroom Burger is great. The mystery sauce adds great tang. A burger, fries and a soda for five bucks it can't be beat. Although I will admit the first time I had the fries they seemed hand made but they were soggy and flimsy. The second time I was there they were crinkle cut fries and an improvement.
The place is small and seems even more claustrophobic with all the eclectic decor on the wall. But that is part of its charm. Besides, most places downtown or mid-town are pretty small. Everything on the wall is pretty funny, for example see the picture of the bibs.
The down thing is is only open weekdays and until 4pm which blows. But after speaking with the guy running the place he states that they close early so he can be home with his kids after they get out of school. So you can't be upset at that!!!