If someone served me a very dark roast of coffee, I would be very disappointed. It tastes burnt. I wouldn't say anything unless asked, but I wouldn't want a second cup.
BTW, we really like the Lavazza coffees. There isn't a huge difference between the more expensive Oro and the Rossa. Haven't tried the "Espresso" 'cause I think it's dark, but the other three are all nice.
Since there is a Lavazza store, maybe they sell freshly ground coffee beans. If so, you could get smaller quantities of the various kinds. I wouldn't bother with both Rossa and Oro, just one or the other. I am assuming that you have an espresso machine and will be making individual servings of coffee.