Hikmet is friendly and very helpful. Even before the booking was confirmed till you left Istanbul, he responded quickly to any query or as requested.
The location is great, just 5-10 minutes walk to Sultanahmet station. It is close to Blue Mosque, Hagia Sophia, Topkapi Palaces. Many restaurants nearby.
The apartment was clean. Daily cleaning provided. In short, whatever good things mentioned by others are true. Insha Allah you will feel at your own country/home when you have Hikmet as your host.