It is really a place to catch a glimpse of Warsaw. Very lively, but not really crowded, if you are lucky you can take part in one of musical events there.
Beautiful architecture, nice views, but surrounded by average restaurants. You can take a drink there, watching clowns, fire dancers, listening to Ukrainian, harmoshka, but if you really want to eat something it is not best recommendation.
If you own or manage Castle Square (Plac Zamkowy), register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.