This Introductory Book, part of my Series on Viennese café culture, explores the Slavonic-framed joy de vivre (in everyday life), foregrounding the historic-contemporary sociocultural context of the Viennese coffeehouse. I address landmark heritage cafés, discursive to Unesco's (2011) official recognition of the Viennese coffeehouse as 'intangible cultural heritage' to Austria, and indeed, the world (Ashby et al. 2013; Haine et al. 2016; Elbendary and Mostafa; Austrian Unesco Commission 2021; City of Vienna 2021d; Unesco 2021). In this framework, I highlight Slavonic peoples' leadership legacy and patronage, as integral to café development (Café Sperl 2017a; Kaffee Alt Wien 2020a; Aida 2021b; Café Hawelka 2021a; Café Sluka 2021b; Hotel Sacher Vienna 2021a). One of the first Viennese cafés was established by a man of Slavic heritage: Colonel Kolschitzky, a leading member of the Polish Habsburg military, who defended the city in the Siege of Vienna (1683) (Bassett 2015; King and Wilson 2017; Kaffeekontor Kolschitzky 2020a; Vienna Now 2021d). Kolschitzky's military victory, supported by Polish King Sobieski the Third, spurred on the establishment of Vienna's coffee culture (1683) (Bassett 2015; Savic 2018; Kaffeekontor Kolschitzky 2020a; Britannica 2020; City of Vienna 2021a; Rhode 2021). Remarkably, Kolschitzky's entrepreneurship precedes some of the oldest European cafes, including Venice's Café Florian (1720) and Paris' Café Procope (1683). Arguably, Slavonic peoples, have contributed an enlightened legacy to Vienna's café heritage, through patronage as an everyday practice, and by their leadership of fine patisseries and culinary fare (Café Sperl 2017a; Lonely Planet 2018b; Kaffee Alt Wien 2020a; Aida 2021b; Café Hawelka 2021d; Café Sluka 2021b). My goal, thus, is to credit Slavic competence, which has been overlooked or not credited, in terms of coffeehouse leadership and cultural development within the Viennese, and broader European context. Thus, I emphasise the coffeehouse as culture, relative to fusions of Slavonic and Austrian subjectivity within the sociocultural framework of 'a second living room'.