Welcome to the Cellar, AZjanny. :D People that are claustrophobic might be uncomfortable, but I wonder if when it's being used, if it's actually much brighter and seem much larger?
I've a feeling these photographs weren't taken in such a way as to show the design and decoration more intimately.

Taking the subway in Stockholm is probably nowhere near as, um, colorful as taking the El or the Subway in Philly. ;)