2 my colleagues and I stayed at Ekim's apartment in the beginning of June 2014.
It was as a picture: clean, cheerful and comfortable. But it was very hard to find it :)
The trick is to say a taxi driver - to orientate on Hilton Hotel and Taksim Square or you will be almost near to the airport:)

Thanks Ekim and a nice girl who met us for these lovely days in Istanbul!