Loungebuddy. Also, my brother flew through there last week, and was able to access a lounge.
Thanks for the info. Really appreciate it. I hope that I will have time to check out IST lounge next week (Only have 90 or so minutes). On loungebuddy, I only see 2 lounges in international terminal, while one says, "This lounge is accessible for business class passengers flying on Turkish Airline", and other is "This lounge is accessible for Star Alliance Gold members flying on Star Alliance carriers."
Since I only have PP membership, and no other status, can I access one of these 2 lounges?