Gülhanim is an amazingly friendly host. I would highly recommend staying with her. She immediately replied to all my messages and helped me to call a taxi in the early morning. My flight was delayed and I had a later check-in than planned but the host didn't have any issues with that and waited patiently for my arrival. Please ask Gülhanim for the exact apartment number and the floor in advance, because I went to the wrong apartment at first, but thanks to great hospitality and friendliness of Turkish people (with the help of a translation app :)), I managed to find the apartment very quickly. Gülhanim's apartment was clean and cozy. Just be aware that there is no door in the room, however, it didn't bother me at all as I stayed in Istanbul just for one night. The location is very convenient for an overnight layover (only 8 minuted from Sabiha Gokcen International Airport by taxi (about 2 euros or 32 TL, can be paid by credit card as well)).