By chance I've found very beautiful charity : GARDEN CAFE TAUSSIG http://www.taussig.cz/index_en which is situated between German Ambassy and Strahov monastery. It's in the heart of historical Prague and turist area but quite hiiden. Project GARDEN CAFE TAUSSIG supports the development of basic working and social abilities of people with mental disabilities and helps them with work and career orientation. So don't expect any special offer but a very nice place, very nice people, beautiful views and good nonturist prices. For me it's more then enough. Photos of the cafe with the views to the Prague Castle : http://www.taussig.cz/photo_gallery