Well my marketing skills sucks so I will be honest. I was born in Istanbul, studied abroad then came back. I like not to work so I spent my time on lazying around, meeting new people, having fun as much as possible on a very low budget. I dont know the city all that well since it is a huge city and not all areas interests me. I live in Kadikoy (center of Anatolian side) so i know this area very well. I have guided many tourists in my time so i know the touristic spots, historical stuff and ect. around the city as well.
So dont expect whatever you would expect from a professional guide. I will be more like local acquaintance of yours to guide you around but who is more enthusiastic about it since money is involved :)