% titlepage, note: you need to include \usepackage{setspace}
\begin{titlepage}
	\vspace*{4cm}
	\begin{Large}
		\noindent \textsf{\metaauthor}
	\end{Large}
	\vspace{1cm}
	\begin{spacing}{2.5}
		\begin{Huge}
			\noindent\textbf{\textsf{\metatitle}}
		\end{Huge}
	\end{spacing}
	\vfill
	\begin{spacing}{1.5}\normalsize
		\noindent Hamburg, \today\\ \\
		\ac{tuhh}
	\end{spacing}
\end{titlepage}
\pagestyle{plain}