I stayed for five days in the apartment n°6 Bosporus Blue Concept.
The apartment is at the second floor of an awesome historic building. It's very detailed and eccentric (there is a boat on the wardrobe! ❤️).
Perfectly cleaned and equipped with all that you need (iron, hair dryer, towels ecc...).
Perfectly located you can reach the bus stop in a 2 minute walking and the main shopping street in a 5 minute walking.
The neighborhood is not so quiet (Istanbul is a huge city that lives 24/7) but if you close the windows the silence is perfect for having a good night of sleep (there is AC so you can cool or heat the apartment).
I highly recommend Berry life apartments because it's perfect for discovering the beautiful Istanbul!