Simply wonderful. La Casa Tazumal was my first experience with Salvadoran cuisine and it definitely won't be my last. While the neighborhood isn't great and the digs are humble, inside you'll find a delicious and unique take on Latin food that often gets overlooked.
Maria, the owner/chef/waitress/propreitor/everything, doesn't speak much English (although the menu is in English), but her friendly demeanor broke through any language barrier, as did, of course, her amazing food. She specializes in pupusas, thick corn tortillas stuffed with various kinds of cheese, beans, and meats that resemble pancakes from the outside, and come served with a type of Salvadoran cabbage slaw called curtido. They may look a bit small at first, but they are extremely filling, and once you pile some curtido on top and try some of the sides (the fried plantains are wonderful), you should be set, and the prices are barely there for food this delicious and hearty.
This place is truly a hidden gem. It doesn't have much in the way of polish or setting, but if you're willing to take a chance and stretch yourself out a bit, you'll find one of the best ethnic culinary experiences I've had in Cleveland in the 22 years I've lived here.