Straight from the movie I google the script:

Geary: Hey, Freddie. Where did you find this place? Fredo: Johnny Ola told me about this place. He brought me here. I didn't believe it but seeing is believing, huh! Man: I see it and I still don't believe it! Fredo: 50 bucks Pat. Old man Roth would never come here, but Johnny knows these places like the back of his hand.

Sorry I hadn't seen the movie in a very long time, forgot the line where he said "he brought me here. I just remembered "Johnny Ola told me about this place." and "Old man Roth would never come here"