We had a fantastic stay at Canberks apartment and even ended up extending because we liked it so much. He and his wife clearly put a lot of thought and effort into the place and it really shows. It's bright with nice and comfortable furniture, it's on a quiet side street and on the fourth floor and as a result pretty quiet. Location wise I think it's in the best area of Istanbul, it's super interesting with a huge number of restaurants, bars and an amazing bakery nearby. There's also easy access to a direct tramline into the old town but we ended up walking pretty much anywhere. Internet is fast, stable and reliable with constant speeds of approximately 100 Mbps download, 20 Mbps upload throughout the apartment. Finally, Canberk has been exceptionally helpful, both prior and during our stay and made sure we had everything we needed. Couldn't recommend more highly.