My stay at Orcun's place was very pleasant. His apart at Besiktas is a cute and cozy place. Orcun ensures that guest is comfortable, he do check in between if we need anything. He is a very professional person, will give us all the privacy. His kitchen is functional and it is well equipped for cooking. His apt is just 10 mins walk to the Besiktas city center. It is an amazing area, majorly visited by locals. The vibe of the Beaiktas is almost same as Taksims's food alleys. Apartment is located in an old neighbourhood, it completely feels safe even at 11.00-11.30 pm. You can book a cab easily using Uber, hence commuting to places like airport or city is also not a concern. I highly recommend Orcun's place, at this price it is really hard to get a place like this.
Only downside is that there is no elevator, so in case you have heavy baggage then you may need some effort. Also, the place is situated near a steep road, so if you plan to walk, then save some strength. But this is a common thing and a way to explore old localities in Istanbul.