I was in Istanbul with my wife. After arriving at Ataturk airport we got a taxi for 20 EUR and it took us directly to the Kerems doorstep.
He greeted us friendly, with an open hart. We talked into the night and he gave us good instructions about places and transports.
Kerems apartment is on a small hill (all Istanbul is up and down) where you get a nice night view at night at the big city (some binoculars would be great).
The bedroom was indeed cozy and the living room has just the rights thing to enjoy after a day of walk in the city. There are small shops in vicinity and on Thursday locals sell vegetables, fruits, spices and fish just in the street nearby. Those vegetables and spices were real tasty.
We traveled mostly using Istanbul transport card, which Kerem provided.
Our host also took some time to manage some personal business. Thank you friend ;)