we asked Saban which of his apartments was the best for our needs, and he recommended us, this apartment. 2 rooms& 1 bathroom (big enough).
we were 2 couples (my parents and me & husband). we stayed 3 nights here.
it is super well located, as you can walk towards the main historical turistic places.
Saban also organized a taxi to pick us from the airport. so i literally arrived in Istanbul with everything well organized.