For UPS carrier, I would put a single star given the big mess that took place over four days and the lack of seriousness of such delivery. A week later, the renewal of my order by the Amazon customer service and ultimately delivered in two days by Chronopost that has not met any trouble finding my address, unlike some.
I thank warmly the team of Amazon's customer service for its efficiency and that's why I do not withdraw of stars for the delay.