Graphic Shop is in my opinion the best art supplies store in the city of Geneva. Nothing special from the outside, it is staffed by passionate employees, who know what they are talking about and enjoy working there.
When I go there, I enjoy seeing kids coming in with their parents to buy their first art kit, graphite stencils. I also enjoy seeing those who come in unsupervised for a can of spray paint, waiting for the owners to ask them what they are going to use it for and leaving all giddy no one raised an eyebrow.
For you see, Graphic Shop in Geneva specializes in urban (semi-legal, depending on where you live) art, and lettering (my reason for going there), offering a wide range of cans, caps, paint markers, and permanent calligraphy markers, as well as your garden variety drawing supplies.
And with employees who know their craft, good prices (lots of things are a lot cheaper than in the bigger stores) and tons of choice, this is really paradise for any budding or seasoned artist.