Its really 3.5 stars
Excellently produced film, story notwithstanding. Really awesome lenswork, beautifully colour graded, on-point soundtrack and gratuitous/intense sex scenes. The editing and pacing of the film keeps the viewer engaged despite being able to see the plotline from a mile away. I'd watch this eye/ear candy again just for the music and the visuals but thats just me and YMMV. It was a pleasant surprise to see that guy from the Suburra series in this even though it was a throwaway role.
TLDR: This is the Italian R-rated version of Twilight.