This place is on the top floor of the Cosmopolitan Hotel. Just ask people for directions and they will guide you because although it is "secret", it's really well known.
I came here sober and I realized the pizza was actually very mediocre and average. My other friends, also sober, felt the same. However, one thing to note is that the freshly baked pies were way better than the slices.
If you're drunk, this pizza will probably taste great because it is very greasy.