ABSOLUTELY LOVED THIS CLASS. I thoroughly enjoyed the History of the City of New York with Professor Sullivan. The man is a walking fount of historical knowledge of NYC. I thought the curriculum was planned out well for a twice weekly class, meeting one day for lecture and one day for a walking tour to various sites such as Central Park, the Lower East Side, lower Manhattan, and Brooklyn Heights. Professor Sullivan often added his own personal anecdotes to both lectures and walking tours which made the class more interesting. It's also a perfect class to take during the summer session since we had beautiful weather for all of our walking tours and it sure beat sitting inside a classroom. Stephen does go off on tangents (as he admits) but I find his lecturing style refreshing. But he really shines as a tour guide because of his vast knowledge of the city. As a native New Yorker who thought knew everything about the city, I was amazed of how much I actually didn't know about the city.
The bottom line: If you love both history and New York City, then I wholeheartedly recommend this class. It was the fastest (and most enjoyable) 6 weeks I have ever spent in a class at Columbia.