No that is a picture of him going into the courthouse in Reykjavík. But prison cells in Iceland are pretty nice though, here is an image of a cell in the new prison Hólmsheiði: https://axis.is/wp-content/gallery/holmsheidi/IMG_1081.jpg
But Litla-Hraun is an older building so the cells are not as nice there.
Well but that's like saying consider yourself lucky to not have been to a Russian or Nigerian jail. American prisons are famously bad and known for it worldwide. I'd compare this cell to a cell in a country that doesn't have a completely broken judicial system and then yeah, it's nothing that special. It's a cell, maybe the bed looks "nice" but at the end of the day it's a place of incarceration not a hotel.
Looking at that picture I'm unsure what makes it "nice" except for the fact that it looks somewhat freshly built.
Cells are cells. What really differentiates prisons is everything around them and what amenities and workshops are offered.