Avati said he was initially very happy to have Stone, 56, on board for the movie but got a shock when she threw tantrums, said the Huffington Post.
"It was a negotiation that bordered on ridiculousness, concerning embarrassing details, as if Italy was a third world country. By the way, we do have electricity in Italy," he said.
The director said Stone's antics didn't end there, either. According to Avati, when Stone saw a television crew and photographers filming a scene, she allegedly left the set unannounced.
"Obviously we did so and she, like nothing happened, shot the scene. The thing that I found most absurd is that she had to call to the States and to close herself in a car, instead of coming to ask us directly," Avati said.
"None of this is true. Ms Stone is the consummate professional," her representative said in an email.