Tough game for Juve to prepare for since Roma are such an unknown quantity at the moment.
On that basis, the key for Juve is to start fast and impose themselves on the game - don't let a fragile Roma settle and and gain confidence.
It was a poor start that made things difficult against Roma last season. They were poor and injury-ravaged, but Juve gifted them a stupid goal to give them belief they could compete. Contrast that to the way Roma have tamely surrendered when Juve have made good starts to the games against them in Turin in the last couple of years.