Good apartment, good host. Location is terrific, near Taksim Square and Istiklal street. The only downside is that it is a steep 2-block climb uphill from apartment to Taksim Square and Istiklal street. The location shown in AirBNB before you reserve the apartment is quite misleading. The true location is about 1 block downhill of the small mosque that is 1 long block downhill from Taksim Square metro. You will get tired of doing that uphill climb.
You can walk downhill to a stop of the waterfront tram, which is convenient. And the small corner grocery stores and fruit stands nearby sell just about everything you'd want, no need to find a supermarket.