Our 8 night stay was amazing at Mehmet's 4th floor studio. Here is our honest straightforward evaluation.
Cons: Stairs are plentiful to get to the 4th floor. But after doing them a few times, it becomes easier.
Pro's: #1 Mehmet is a great host. Full of information and always willing to share. He made everything so easy with arranging taxi's to making suggestions for eating and places to go. He supplies us with portable wifi and a transportation card at minimal fees. Really, his help added so much to our journey around Istanbul.
#2 Location was fantastic. So close to the major sites of Istanbul. To venture out of the district was easy as we had our own wifi hotspot thanks to Mehmet.
#3 Grocery stores are abundant around his location. Most are small, but you will quickly find which store has what you are look for.
Overall, I would not hesitate to stay here again.