We had a family reunion in Istanbul and stayed at Muhammed's place. This is a great apartment close to lots of restaurants, with fantastic views and tons of natural light. There are also a few grocery stores within 5-10 min of walking. The owner and his friend are very communicative and they help with anything you need. They also arranged for private airport transfers for us at a reasonable price, which we appreciated.
The unit is up two flights of stairs and there is no elevator; just a heads up if you travel with family members that have limited mobility. Also, the kitchen is very cozy but unless you plan to spend a lot of time cooking, it is more than enough.
Overall, great experience and I'd totally recommend this place.