It will be your best choice whatever you are going to stay for short or long period. It's next to Istiklyal and Taksim, so you can get to Taksim from the airport by Havabus and walk 10 min to the place. Cheap, fast and convenient.
Edip is cool guy, respectful, joyful, hospitable. He speaks English well and knows some Russian words (Привет, братан! Как дела?) =)
He's let me check in at 9 am without extra fee. There are stable WiFi, free laundry, free tea/coffee, equipped kitchen, clean bathroom.
Room is cozy and clean. And it's very quiet place and there're no many rooms, guests like in a hostel. So nothing prevents you from sleeping like a baby.
Strongly recommend to stay here.