Jorrit G.
Yelp
This place is huge! It has a small front where they make the coffee, there's a restroom if you walk straight ahead. If you go right however, there are stairs leading into the depths below.
When your eyes adjust to the light, you can see the multitude of seating; there's small tables big tables, chairs, loveseats, a rocking chair, a small bookcase with titles solely from Clive Cussler (?), and some magazines. It's all very atmospheric.
Onto the coffee. There's different ways and kinds available to choose from, the aeropress, v60, chemex. I chose the Rwandan coffee through aeropress, and boy was it delicious. You get a card with information about the coffee in both Dutch and English. It's all served in a classy way, and the staff is friendly.
If I lived in Arnhem, I'd be going here a lot more often. Sadly, I live more than an hour away. I think that says enough about the kind of place it is.
Note: I don't think the cave is accessible by wheelchair, but I could be mistaken. The coffee is great enough to just get it on the go too, but sitting here is very relaxing.