I'm a real New Yorican so I feel confident that I can judge for authenticity. I've been to Puerto Rico a couple times & my Puerto Rican family still lives in Brooklyn. I moved to Avondale about four years ago.
My wife had a $25 off coupon (total must be at least $50) from Restaurant.com. ENYC's website doesn't have their menu...WTH?! Seriously? C'mon! Luckily a fellow Yelper posted a pic of the menu. When I called to place my order, I was informed that the coupon is only good if 5 entrees are ordered. The owner was very nice and patient.
There isn't a real marque on top of the restaurant, so I was lucky that there was day light. You literally walk into the kitchen. There is a table outside if you want to dine-in.
The owner was super nice and even gave me some beans on the house. You can tell that the food is made with love. It sure did smell authentic.
I got home and my family devoured it. Big portions so lots of left-overs.
Yes, it's authentic. Next time I'll try a flan and hopefully they'll have some pasteles available. Totally understandable since Christmas just passed. Pasteles are the Puerto Rican equivalent to Tamales. They aren't easy to make and traditionally are eaten during the holidays.
I'll be back.