This 18th-century fountain is built in Baroque style and its location right in the historical city centre makes it a popular meeting point. It is located right in front of the Church of Our Lady (hence the name) and close to other interesting places to visit (e.g. the Kleinmarkthalle). The area near the fountain is also full of cafés and shops.
Wikipedia (German) http://de.wikipedia.org/wiki/Liebfrauenberg_(Frankfurt_am_Main)#Brunnen_auf_dem_Liebfrauenberg
More information on Frankfurt-tourismus.de http://www.frankfurt-tourismus.de/en/Media/Attraktionen/Brunnen-Denkmal-Skulptur/Liebfrauenbrunnen
Address 31 Neue Kräme, Frankfurt am Main 60311, Germany
Coordinates 50°6'45.633" N 8°40'53.17" E