Hyderabad home buyers: what's your real 'all-in' cost experience?

Honestly, the whole 'all-in cost' feels like a myth in Hyderabad. I'm fed up of renting near Gachibowli, landlord raised rent. Finally taking the plunge for a 2BHK, maybe Begumpet. What's a realistic negotiation percentage with builders like Salarpuria Sattva? Are hidden charges always popping up at possession? Need true EMI vs rent math.