I don't like the top bar, I don't like the menu bar, I don't like the logo, I don't like the footer.
I hate the semi-transparent responsive menu.
I don't see how to choose the car.
You only show the available cars and the potential client must contact you to ask about the available cars.
I don't like your Gmail, it's not professional.
The sidebar is too close to the content area and has an awful blue border.
And I don't like that black, dark frontpage image.
I would like to see a nice scenery road with lush green plants and an ocean view instead.
Photos of renters with blurred faces are awful, better remove them.
All 6 "reasons to chose us" - make a header slider and add each reason as a slogan on each slide.