We enjoyed our stay at Mehmet's place. The apartments is well maintained and centrally located to all the local attractions as well as dining / shopping areas. (all within walking distance)
Mehmet is a wonderful host...on our first day in the city he came along and showed us the directions to the local sights.
He also turned up on the early hours when we were leaving to drop us at the airport.
Will certainly come back to Mehmet's place when next in Istanbul.