The apartment is perfect for some nice days in Istanbul. It‘s super, super clean, the furniture is really nice, very cosy and cool atmosphere and a comfy bed. You‘ll find everything you need and for your morning coffee you just need to go downstairs in the next cafe 10 meters away. There is also a safety door, an elevator and a really good hair dryer. Check-in, communication etc. also 5 stars, without a doubt!
The only critical thing is the noise level at night. I don‘t know how locals perceive it but for us it was loud. Also I can‘t tell how noisy other apartments in Istanbul are. We just bought two pairs of earplugs and everything was fine. If thats ok for you, go for it :)