This is a great place and ISIK is a very good host.
The house is 1-2 minutes from Taksim square. The street is not very noizy. 10 minutes walking distance a supermarket, dozens of cafes around.
The flat is warm and cozy. we didn't use the TV, but used the fridge, kitchen and washing machine - everything worked.
Hot shower is very good thing after a long trip.
Isik met us in the evening, helped with the bags. Later on whatsapp he helped to order the food. I guess if you need a phone card, water or something else you can also ask him.
I highly recommend this place as a short term place in the center of Istanbul. Why short - term? For a family with a baby it can be a bit small if you stay for a month or more. But a week or two weeks - great!