It's a subway station on line A and also a square that I discovered at random because the hotel was in the vicinity. It is not a sought after tourist spot but it is worth going in the late afternoon after d having known the other sights in Prague. In the square is the Church of Sta Ludimila. The night the square was dimly lit the two times I went, but there were always families, children playing, couples of lovers, people walking with pets.