Penn Quarter - ChinatownRestaurants Judging Restaurants – Rosa Mexicano by Prince Of Petworth September 28, 2010 at 12:00 pm 30 Comments Rosa Mexicano is located at 575 7th St, NW. I walk by this spot all the time and no matter what time of day the place seems to be buzzing. So how’s the food? Any must order items? You can see their menus here.