Kwiatkowski's name is most closely linked to the construction of the port and the city of Gdynia, the Polish "window on the World", the largest investment of pre-war Poland. This project, which at first encountered many difficulties, was achieved through its efforts. Gdynia was not the only work of the minister. As part of the country's modernisation programme, he besides sponsored the construction of the Central Industrial District, in which Huta Stalowa Wola was created.
However, he would be incorrect to think that Kwiatkowski was a kind of technocrat focused on numbers and charts, without showing feelings. Nor was he, unlike many visionaries, an insufferable cholera with which cooperation is destructive in the long term. He did not prove his reasons by shouting out and overbearing tone, but by reasonable reasoning. A fewer years ago, the City Museum of Gdynia ordered a graphic study of the minister's letters. From its results emerges the image of an ambitious and very industrious, yet shy, delicate and somewhat withdrawn man, who is far from the stereotype of the ruthless manager known from modern corporations. Kwiatkowski surely had the gift of focusing young people around him. As Jan Nowak-Jezioranski recalled after years, the Deputy Prime Minister gained their sympathy with “the vitality of the head and the wonderful gift of the message.”