Draft itinerary only! Please come and check again for actual stories! :))
Day 1: Around Sultanahmet (Hagia Sophia, Blue Mosque, etc), Grand Bazaar, Beyazit
Day 2: Ortakoy to see morning market, Dolmabahce (not entering palace though), Taksim, Istiklal avenue, Galata bridge..
Day 3: Topkapi palace, then take bus to Eyup. OTW back stop at Suleymaniye mosque, Spice Bazaar, etc
Day 4: Take ferry to Uskudar in Asian side, then take bus/whatever to Hyderpasa, Kadikoy. Take ferry back from Kadikoy to Eminonu.
Day 5: Probably manage to do last minute shopping (not much intended) in Grand Bazaar before leaving for airport in the afternoon.