Hi Hikmet,
I have finally reached UK and got time to review our visit. Hikmet is very thorough and polite in his communication, we were circumspect of the place like any other tourist, but it was good value for money - 6 people for a night in a decent size flat right in the middle of old city and yes there is a slope to climb but this did not deter us.
Hikmet will give you a map, he arranged for us to be collected from the new airport which is very far etc. at the right price. He explained to us the local tube, tram and markets and also food place (good quality vegetarian food - a tad expensive but quality was great).
If I ever visit Istanbul, I would stay with Hikmet, but sadly me and my wife are more into exploring the world with our kids.
Thank you,
Jeewan