Learn Polish: Ten nowy odkurzacz użytkuje się intuicyjnie. - This new vacuum cleaner is intuitive to use.

The się construction here forms the middle voice. We use it to describe an inherent quality of the object and how it handles an action, similar to saying 'the book reads easily' in English. While jest użytkowany just states a passive fact ('it is being used'), użytkuje się intuicyjnie focuses on the user experience ('it is intuitive to use').

Could I use używa się instead of użytkuje się?

Yes, używa się is grammatically correct and very common. However, użytkować is a bit more formal and technical. It is often used in manuals, reviews, or formal descriptions of appliances, software, or property, implying the ongoing operation or utilization of a product.

The English translation uses the adjective 'intuitive'. Why does the Polish sentence use the adverb intuicyjnie?

Because the Polish sentence is built around an action verb (użytkuje) rather than the verb 'to be'. You are modifying how the vacuum cleaner 'is used', which requires an adverb. A literal translation would be 'This new vacuum cleaner uses itself intuitively.'

Is Ten nowy odkurzacz in the nominative or accusative case in this sentence?

For masculine inanimate nouns like odkurzacz, the nominative and accusative forms are identical, which can be confusing. However, in this specific middle voice construction, the object undergoing the action functions as the grammatical subject, meaning it is in the nominative case.