Sight seeing in turkey

Hi
I need to know must visit areas in istanbul and its outskirts. I will be travelling to istanbul in first week of july this year with my family and want to know the reasonalble hotel to stay and must visit locations.
I am planning 5 to 6 day trip. Before i forget, i need to know about taxi service also.

Thnx

Take two or three days to explore SultanAhmet.  You'll need a full day for the Palace, another two for the Blue Mosque, Hagia Sofia, Grand and Spice Bazars and other mosques.
Take a day for exploring Kadıköy and one for Eyüp/ Pier Lottie.

The metro system is well connected in Istanbul. Prefer it over taxi. Taxı drivers tend to rip off everyone often big time.

Good luck