Aquilani made the switch last week.
"Why did I choose Fiorentina? Because they showed that they wanted me, it's an interesting journey and I can do very well here," he said.
Aquilani had already been linked with a Viola switch last summer, but opted for AC Milan instead.
"I'd like to clarify that I had given the all-clear to come to Florence, but not on loan. I wanted some sense of certainty that I could stay on for another year.
"Nor is it true that I was an outcast at Liverpool. I had a good rapport with everyone there."