I love the layout of Sienna Mercato! It's 3 stories with Emporio (meatball joint) on the ground floor, Mezzo (Italian restaurant) on the second, and Il Tetto (rooftop beer garden) on the third. I've only been to Il Tetto.
After a long day, I wasn't ready to navigate this place but the staff were very friendly and accommodating. They showed me the elevators to the beer garden (it's in the back) and the best spot to view the skyline (also in the back). It's only a small section of the Pittsburgh skyline so while not breathtaking, it's still a scenic and open beer garden with its pretty strings of light.