Walked past there at 10:00am today and decided to try it out. They are open 10:00am to 4:30pm Monday to Sat.
Food is ordered at counter but they have decent number of tables with tablecloth (I am suprised at that). Service at the counter is friendly and they answered my questions (helped that they weren't busy)with a smile.
Since I am not familiar with Nicaraguan food I can't vouch for authenticity, but the food is good in my book and worth repeating.
They had two kinds of soup Carne de Res (Beef soup with veg) and Mondongo (tripe soup). I ordered a small tripe soup ($3.75) and it came in a good size portion with 3 corn tortillas. The soup is of a clear stock with onions and potatoes and large chunks of tripe, a different approach than menudo. A large one is definitely a meal on itself.
They have lunch specials every day.. Today's special was salpicon (minced beef), lomo de res con vegetales (beef with vegetables) Baho (steamed beef, yucca and cassava) and Lengua en Salsa (Beef tongue). I opted for the tongue $9.95 and it came with rice and beans. After the soup I couldn't finish the rice and beans, since I have dinner reservations at Scott Howard tonite and need to save my appetite :-)
They had a variety of home made drinks. I ordered the Pitahaya (Dragon Fruit)$2.50. I don't know what a dragon fruit is, the drink is red in color with small soft dark seeds with some sweet flesh (reminds me of a papaya seed but softer). Tastes good, definitely would try it again. They also have assorted desserts but I really needed to save room for dinner.
Overall, a pleasant experience, would definitely stop by there for lunch again.
From what I can tell they seem to do a lot of take out orders.