As long as I've an apartment in Vienna & my girlfriend doesn't mind having guests: So yeah, August next year should work! For the festival: I believe you mean

As long as I've an apartment in Vienna & my girlfriend doesn't mind having guests: So yeah, August next year should work! For the festival: I believe you mean the Sziget Festival: http://www.sziget.hu/festival_english http://www.sziget.hu/festival_english