Styled like a McDonald's. That's a sad first line. Let me try again.
Authentic Italian espresso joint. There, that's a little better. Italy is known for coffee. And I'm a huge fan of most things Italian. But here's the real story: Italians helped to pioneer coffee (especially espresso); but Americans perfected it. Well not Americans in general. But a few people in America. It's called the third wave of coffee.
La Prima seems ok but mostly kind of a wilted style and under par coffee. If you're from Italy or simply like coffee, you will probably find some enjoyment here. But don't come here for truly artisan coffee. The macchiato I had here once had a not very good flavor (burnt?) and way to much coarse foam on top. Exceptional third wave-quality coffee can be obtained at places like 21St. a couple blocks away, or 4121 Main in Bloomfield. Sadly not at La Prima.
A few points for authenticity, minus a few for not actually being that great.