Getting to see Golconda Fort, Charminar and the Palace was amazing especially with Navin providing factual and honest insights through the experience. For me though it's the little things that made this so amazing, Walking through the side streets of the old town, having Irani Chai and biscuits from the local bakery and then heading to a great little restaurant and having biriyani and a thumbs up (make sure you get the Garlic Naan as well).
More tours should be run like Navins, he makes it far more personal and tailored than others I've been on