A very nice friend of mine (I met him via Internations) gave me as birthday present a book entitled "Only in Vienna", which tells about hidden (or at least non-conventional) places in the city, mixed up with history. VERY INTERESTING BOOK for those how live here and want to know something beyond the classic tourist info.
The style is very easy and it invites to keep on reading. Information is accurate and there are interesting pictures.
After that one, I bought now "Only in Prague" from the same author. It is also very good.