This homage to 1970s era giallos is on-point. I disagree that you can't tell the movie is not 40-50 years old - there are some visual clues that expose Francesca as a 21st century film that may actually be editing or cinematographic flaws - BUT it pulls out all of the stops to closely resemble the best of 70s Italian gialli flicks otherwise.
Francesca has plot twists and fabulous color, even antique furniture and accessories are used on the set. The killer's gloves are red instead of black, but elements ranging from the creepy usage of mannequins and dolls to haunting dream sequences hearken back to very specific giallo directors. I found one scene particularly disturbing in its usage of psychedelic visuals combined with auditory cacophony.
I have no idea why this does not have a higher overall rating, I know some giallo fans are sexploitation hounds and actually give higher ratings to frankly stupider giallos as long as they pile on the nudity and suggestive misogyny, so beyond a single scene of masturbatory titillation for our killer those individuals are surely disappointed. Oh well. Too bad for the misogynists, fake frowny face.