Devrim's place is exactly as described - private, peaceful, spacious, and had all the necessary amenities one could need.
The apartment was spotless and in an extremely good location. Public transportation is close, but it's also very walkable to main attractions. We walked to all the main attractions, and the apartment is close to great restaurants and cafes.
Devrim as a host was excellent - responsive, respectful, and kind. The instructions were clear, and we got lots of good recommendations.
I can only recommend the place to people wanting to spend some time in Istanbul. It's awesome for short and longer stays.