Many thanks to Selim we had a wonderful trip to Istanbul. It all went completely right because of his great hospitality. We were very tired and winter-depressed when we came to Instanbul and were not really prepared (didn't check all interesting places to see and where to go) Selim showed around and advised a plan for three day-stay.
Also we have to say the location is great, the street is quiet, all places worth seeing, the sea and shops are nearby (alcohol is sold out until 01:00 a.m., hello to St.Petersburg with alco shops closing at 22:00)