It is defined as something or someone that is pleasant and attractive, and in this context we are mainly confining ourselves to a car's visually appeal - and the quirkier, whimsier or prettier the better in our book at least as far as this story is concerned. 

So these are the cars we will be looking at here. It’s really just a matter of opinion. If there are cars which you think should have been included but weren’t, or were but shouldn’t have been, it’s fine – we’re both right. Let’s take a look at our choices: