Many nice restaurants, cafés and bars are located around this very central square with a fountain in the middle. There are also many shops selling clothes, cosmetics and various accessories so don't hold back and enjoy a proper shopping spree in the heart of Frankfurt surrounded by countless skyscrapers.
Wikipedia (German) http://de.wikipedia.org/wiki/Kaiserplatz_(Frankfurt_am_Main)
More information on Frankfurt's official website https://www.frankfurt.de/sixcms/detail.php?id=7916176&_ffmpar%5B_id_inhalt%5D=7890711
Address 18 Kaiserstraße, Frankfurt am Main 60311, Germany
Coordinates 50°6'38.204" N 8°40'30.68" E