I went to the address listed on happycow, but it was an apartment building. I then wrote to the email on the website asking whether they had a physical store or just an online store, as when I tried to visit I only saw an apartment building. Also the online store does not list the prices, just the products they have; probably because they are mostly wholesale. Someone, I believe, the owner wrote back to me and mentioned they are mostly wholesale and sell to restaurants, etc in Europe and on occasion sell to individuals.
I would recommend calling or emailing before going to the physical address listed on happycow as I do not believe it is possible to visit an actual store.