 His most notable interior design was the Le Chat Doré cafe in Helsinki (1929), which was Parisian in style, with references to Art Deco.The café was run by Carlstedt's mother Amanda.Carlstedt drew inspiration from the café L’ Aubette in Strasbourg, which was styled by Theo van Doesburg, Jean (Hans) Arp and Sophie Taeuber-Arp in 1926–1928.