Tolga is a fantastic host, going above and beyond to make sure you have a comfortable stay. His communication from start to finish was clear and thorough, and even though he initially provided us instructions for a self check-in, he ended up being able to meet us.
The apartment is in a wonderful neighborhood, Cihangir, which is filled with great coffee shops, restaurants, shops, and the best bakery just 2.5 blocks away that we visited daily. We found it to be fairly quiet too, though there were some sounds from neighbors, but we also visited during Ramadan and Eid al-Fitr. It's a 10 minute walk to Taksim Square or 15 minutes to Tophane, both metro stops that will give you easy access to any key sites.
The apartment has everything you need for a nice stay: A/C or heat, tea, instant coffee, a stove, small fridge, water kettle, decent Wifi, and a washer machine with provided laundry detergent.
I highly recommend Tolga's place if you're looking to experience all of the wonders of Istanbul, and in a much less touristy neighborhood!