Great apartment, location and host.
Apartment is tasteful, beds are great, there's a smal balcony, all the facilities you need are present. The sleeping couch is suitable for 2 people if needed and sleeps good enough. We were with 5 guys and had all the facilities and space we needed. We didn't cook, but it's possible. There's also a dishwasher and washing machine present.
Location couldn't be better, if you are looking for a central place near Taksim where it's always busy and alive. Step out of the door and you are there. If you are looking for more peace and quiet, the location is maybe not the best, but in the apartment itself you didn't hear the noise so therefore the apartment is suitable aswell.
Rutkay is maybe the best host I've ever had. Clear communication, he's on point, professional but nice and just a really relaxed dude. For example, he even checked up on my halfway the stay, and checking in and out could be adjusted to our flight times.
Overall a great experience, no hassle, and just a lot of value for what we paid. Would definitely recommend!