This small Puerto Rican restaurant (it's really more like a lunch counter or a diner) is located just south of 14th Street on 8th Avenue. Some reviews here and here and here. This classic New York City place has been around for years.
It's simple and inexpensive and the food is consistently good. Nothing fancy, just a super filling plate of rice and beans and roasted chicken. Everything is very authentic and I always have a great meal. The staff is extremely friendly and they also make a decent cup of espresso. Highly recommended. It's definitely not on the tourist maps, but is just a little part of what makes up my New York.
I always sit at the counter. On my most recent visit, I made friends with an aspiring movie producer who sat next to me named Michael. He enjoyed the food as much as I did.