It is not easy to find a place to hang-out with a good free wifi in Jakarta which opens until late. So, if you're in Jakarta and looking for a decent internet connection ( I said decent, don't expect a high-speed connection, okay :p) at anytime, you can come to this place called Dunkin Donuts.
Mostly, Dunkin Donuts' outlets in Jakarta (and around Indonesia) open 24 hours and they have breakfast set, a sunny egg sandwich with tea or coffee. The place is quite comfortable, but the electric sockets are limited and they provide two pins sockets only.
This is the address of Dunkin Donuts that I went to:
Jalan Bandengan Selatan No.62, Tambora, Kota Jakarta Barat, DKI Jakarta 11240