This here is an honest review
Pros: clean place, air conditioned, close to Taksim square, close to a metro station, the neighborhood is hippyish and there is daily maid service
Cons: place is small not an apartment it’s a hotel room; doors and walls are too thin like the place is made of cardboard, furniture is the cheapest you could find at Ikea and worn out there is rust, the closet is falling apart broken mirror taped to stay in place(i have pictures to prove it) bathroom is super small, the tv is decorative, the internet speed is 2mb/sec at best, no elevator be prepared to climb steep and narrow stairs if you have luggage. The neighborhood is pretty outlandish and walking back to the apartment at night is pretty skittish
After experiencing it myself i could say the pictures provided in the ad are overstated and the reviews are highly padded.
Hope this is helpful to fellow travelers and the host.