Price-Quality ratio = 10/10
After one week in Istanbul, I switched from a 4-star hotel to AirBnB because it was cheaper. These guys proved that cheaper doesn't mean less comfort. Firstly, I have never felt more comfortable in someone else's home than I do here.
It is a simple room, but it has everything you need for a comfortable stay. When I entered the apartment, I could clearly see how highly they value hygiene. While Istanbul is a major metropolis, I had the feeling that I was staying in a small village near the city. The hotel is situated in the heart of the city, but at the same time it's not the touristy part of the citycentre. All public transportation is available within a couple minutes walking distance. Additionally, the double-glazed windows muffle outside noise very well.
I will definitely come back here again next time I am in Istanbul.