Pros: The apartment was as described, the furniture and the whole place was impeccably clean. The a/c was vital on some hot days and our stay was 5star. It is a modern clean place, and right around the corner from all of the cafes and restaurants in Besiktas.
It is ideal for longer term stays, great internet, desk and quiet.
Cons:
Not close to a metro station. Accessibility to Taksim and the "touristic" places on the other side isn't ideal to be honest, heavy evening traffic and taxis unwilling to brave the traffic caused us to have to pay upto 200 lire to get back from Taksim. We found the ferry from the port which is a 5 min walk to downtown and that made it more convenient and a scenic route to reach there.
Overall, I recommend this place.