Unfortunately there are only 5 stars provided on Airbnb site, because otherwise I would have given more. All in all, Mahmud's apartment is a top of the class accommodation in Istanbul (fuori classe as the Italians call it).
The location is a 3 minutes walk from the Sultanahmet Mosque without any hills or slopes, so it is perfect for those who have difficulties walking up the slopes of Istanbul. Inside the apartment, everything was carefully decorated and provided, from the washing detergent and a very functional washing machine to a high-speed internet. There are 4 rooms and each room is equipped with a flat screen TV complete with a lot of channels, including several in English language. The Marmara sea view from the spacy living room adds a sense of tranquility inside the apartment. It is a home away from home. The neighbourhood is lively, full of cafes and shops but at the same time it is quiet and very comfortable to live.
Mahmud understands all our needs and he was very fast in responding our messages. He was always available when we need help. My family and I are grateful for his kindness.
I would recommend Mahmud's place to any family planning to visit Istanbul for a memorable stay.