Isik’s place in a nutshell: comfortable, clean, only a 3 minute walk from Taksim square, several grocery stores and restaurants nearby, easy to grab a taxi or jump on the metro, what you see is what you get.
Isik will respond to your messages faster than your spouse/partner. He was very accommodating in helping arrange a (very-nice) taxi service from the airport. He knows the area well so any questions you have, he will do his best to assist you.
The only down side (for some people) is that if you’re sleeping on the sofa bed, you will hear noise from the street late at night. I sleep better with noise so it did not bother me.