Karem's place is a building with several AirBNB rooms, two per floor, with a comfortable lobby. There's someone at the front desk 24/7, which was great for security and for help with arranging transportation to and from the airport. The location is fantastic—just a couple minutes' walk from Taksim Square, but on a quiet side street.
The room was clean and comfortable and had everything I needed. Housekeeping freshened it up every day. The shower had excellent water pressure, the wifi was pretty reliable, and the bed was comfortable.
Karem was very quick to respond to my messages, and was pleasant when I met him in person at the front desk when I checked out.
For the price, this is an excellent find near Taksim Square.