it's very close to the nishijin textile center, if you are trying to find it you can ask here.
i've been meaning to check it out for a long time, and it's definitely worth it. i hope to take some friends to visit it in the next couple weeks, and actually try the dye process. the people who run it are great, very friendly, and enthusiastic about speaking english. the photo above is one of the lovely large tatami rooms where the indigo dyed products are displayed.