apartment for four persons in Istanbul preferred areas are besiktas and sisli

Hey! we are students coming from Pakistan for doing an exchange program at Bahcesehir university. Currently we are enrolled in Lahore School Of Economics and doing Bachelors in Business and Administration. we have been selected in the exchange program of Bahcesehir university so would be staying in Istanbul for like four months altogether, and we are in searching for the apartment in istanbul referred areas are besiktas, sisli or taksim. If anyone has any apartment on these dates kindly hit me up.