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The mosque is rather interesting, as it reflects a Javan style just beginning to be adapted to Islam. Gates have roofs in the same stacked meru style of Hindu temples, and you can even find depictions of the Hindu god Kali around the graveyard.
The small streets and alleys around the mosque and graveyard can be quite charming to walk around in. There's a slower pace to life here despite the modern times.
Today, the Kota Gede area is better known for its many silver shops. You don't have to go far from the graveyard of the first sultan to find a large silver factory. These can be quite nice, but the prices are not as good as Bali.