Map for Super Potato in Akiba?

Hi! It seems I cannot find any map to Super Potato (yeah, the famous retro gaming shop in Akiba) on the net and I was asking myself if someone has a map to it or at least very clear directions to it as everything I read all over the net is somehow confusing, as the shop is placed in a side street.

If you can read Japanese the link for superpotato is:
www.superpotato.com

The link for the store locations is: http://www.superpotato.com/free_html.php?html=about_shop.htm...

The Akiba store is the first one at the top of the list.
The direct link for the Japanese map is:
http://map.yahoo.co.jp/pl?nl=35.41.46.096&el=139.46.26.230&s...

It's still quite difficult to find the little sign pointing to the 2nd floor. I found it by trying to follow the map and listening for the Super Mario music piped into the alleyway ^_^;

Good luck