Have been in both the Premier Lounge and Purah Indah lounge at CGK in the past month, and both are quite poor.
The Qantas website says the Premier Lounge, but prior to a QF flight was escorted to the Purah Indah one. So maybe you can make a choice between the two.
Premier Lounge had wifi that worked, but not much food or drink options. No showers, but nice-ish toilets, a smoking room that may as well have a witches hat instead of a door and the chairs aren't spaced out much. Staff are nice and regular announcements for boarding are made.
Purah Indah has the most useless wifi ever, but have a bit more food and drink options. They have bottles of soft drink and water, and the food is well labelled. Toilets aren't great there and no showers. They have a little first class section, which I think is used for the emirates flights, but has the same food and drink, just segregated from the rest.
