The JW Marriott Jakarta is an excellent hotel, and in fact that's where I'm staying right now. Golds are treated well: you'll get access to the excellent lounge, which serves up breakfast, tea and almost-dinner with free booze to boot.
In Jakarta, though, hotel location is a critical factor because the traffic jams can be so hideous, and the JW scores a little lower in this respect because it's a bit to the south of the city core. Whereabouts will you be working?