this place is super clean and comfortable. You have a very spacious room, good internet, a warm shower, and a kitchen where you can prepare tea, coffee, and sandwiches.
It is also easy to move around by train and bus. The neighborhood is lovely. It's a great place to stay in Istanbul.
note that you will stay in a beauty center. The room is very private, but you will hear people walking around from 9:30 onwards. during the evening the place is very quite.