Exit JR Sibuya on the south-east side, as if you were going to Aoiheya.
It is a rather long walk to Club Crawl.
Address is:
渋谷区東１-２５-２丸橋ビルB１1-25-2 Higashi, Shibuya Building B1 Maruhashi

Best way to get there is:
Exit JR Shibuya station near the Toyoko line. Cross the street (either on the foot bridge, or the crosswalk near the taxi pickup).
Turn right.
Walk your ass off.

The map is not to any sort of scale, so your primary land mark that you are getting close is the Life grocery store.
Really
Its far.

Don't get discouraged.