Kerim's place was comfortable, very accessible, and located on a busy avenue in the textile district of Sisli Istanbul. The metro station is a couple of minutes walk and the bus station was at the building's doorstep. The location was perfect for us as we needed to be close to Levent but wanted to be able to quickly reach the historic center.
Kerim was very responsive and Mehmet, the concierge, was extremely helpful and promptly accommodated all our requests.
Cons:
On days when we stayed to work from the apartment, there was construction noise during the day, which made calls and concentration in general difficult.