Zeki is a great host. Give me a moment and I'll explain why. We stayed for a week in the middle of December 2018 - 5 adults, 3 kids. It's a perfect flat for several families. It allows to have enough privacy yet gather all together whenever you need. For example, if you want to go to sleep earlier than the other friends, you just go to the far room and the voices of your fellow travellers will not bother you. On the other hand, if you need to discuss sightseeing program for a day or eat with your friends, you can use the big table in the spaceous hall. Kitchen is equipped with everything you need to cook your own food, it has a dishwasher and an oven - which was very important to us. Zeki gives towels, linen, showering things like shampoo, hand soap, etc. It's like being at home, really.
Speaking about Zeki himself, we'd like to thank him for being nonintrusive and helpful in cases we needed his help. He gave us advice about Istambul sights, restaurants, shopping, SIM cards - everything we asked him about. Traveller 101 info, in short. He was always on the line either by phone or text.
For Russians: Для русскоговорящих путешественников особый сюрприз - в соседней квартире живёт русскоговорящая девушка Гаринэ, которая всегда очень приветливо и с душою помогала нам разобраться с техникой в квартире.
To sum up: it definitely does worth staying at Zeki's place, especially in case you are travelling by 2 or 3 friend's families together.