I traveled to Istanbul with two young boys (5 and 2) and my wife. We stayed close to seven days in this wonderful apartment. This space was perfect for us. Izel was an exceptional host. He helped book our transportation from the airport and back. His suggestions for eating and for coffee were excellent. There is an excellent coffee shop OLD JAVA around the corner that is open til 10PM. He was available on WhatsApp whenever I had any questions.
The place is clean. The bathrooms are great. It is a two floor walk up but it's not bad at all. If you're coming to Istanbul expect to be walking up and down hills most of the time anyway. The street gets quiet in the evenings. You're close and far enough that you can escape the odd tourism stuff. We like to buy local groceries and cook food at home - there are tons of places to get great vegetables and meat.
If you're looking to come to Istanbul with a young family, this is the place to go. As my kids get older and we think of visiting Istanbul again, we will definitely be hitting up Izel again.