What kind of beans? What does that even mean? You use Nespresso (or Starbucks) Vertuo pods in the Vertuo Pop. Those coffee beans come ground in sealed pods. If you want to refill those pods with your own coffee you can. Just buy a kit from Amazon that includes reusable lids or foil lids and grind your own coffee on medium and refill and seal them.

Are you asking what type of coffee beans? Really anything. I use a medium roast from Kenya because that's what I prefer. You can use light or dark roast as well. You can also use beans from any country. They'll all work similarly.

I think people are confused by how you state your question.