Flosmarty Square, not far from St. Stephen's Church, I walked from there. It is a block for walking, shopping and coffee. The square itself is not big, but he happens to be at the center of the two streets. There are plenty of coffee shops, dessert shops and some interesting little shops on these two streets. If you have more time, you can relax here and spend an hour or two enjoying the street view of Budapest and the crowds of the past.