% adjust the page margins
\usepackage[scale=0.75]{geometry}
+% required
\moderncvtheme[blue]{classic}
% possible themes are "classic" and "casual"
% optional argument are 'blue' (default), 'orange', 'red', 'green', 'grey' and 'roman' (for roman fonts, instead of sans serif fonts)
% optional
% \address{street and number}{postcode city}
% '\\' adds a line break
-\address{Teststreet 17}{03333 Nicecity\\ Switzerland}
+\address{Teststreet 17}{03333 Nicecity\protect\\[0.1em] Switzerland\protect\\[0.2em]}
% optional
\phone{+43(0)999 9999}