Oytun was a very helpful host. The apartment is actually more like an apart-hotel which was actually quite useful as it meant 24hr reception, maid service everyday and free breakfast.
The apartment itself was very clean and comfortable. The location is great- very central, only a 2 minute walk to Taksim Square. It did mean that it got quite loud at times, particularly on the weekend nights when there were lots of taxis about late at night, but that's a small price to pay for the location.