Apartment's location is everything you could hope for in the Nişantaşı area. It's about a minute away from the Osmanbey Metro station, which takes you to nearby Taksim and other areas such as Levent, Gayrettepe and beyond. It's also at a walking distance from everything Nişantaşı has to offer.
Moreover, it is very spacious and the bedrooms are quiet, so you don't need to worry about getting a good night's sleep, despite being located in an area that is otherwise very vibrant day and night.
The kitchen has the basics, but could be supplemented with more items to make the cooking experience more convenient for long stays. Installing a proper stove/oven (if possible) would be a nice and welcome touch, for example.
Fırat is a good host, very responsive and willing to help with any issue that arises. We had some trouble with hot water in the first few days, but Fırat was able to secure a plumber even during the Ramadan holiday period, which was much appreciated.