I tried to find where is it located actually. But the owner of the page only shared this info: "A photo gallery page of chef, food stylist Kaoru Mitsui". So I think they have not opened anywhere and just shared their food photos, even if it opened, it would be in Japan.
And today, they officially announced that they have opened their cafe on August 19th at Shoan Bunko, Japan. They uploaded some photos of their celebration party, which looks homey.