Great overall experience! Onur and Yousef are great people. They will socialize with you, but also respect your privacy at all times. The apartment is clean and in a great location right in between the centre and the airport. The tram towards the city is only a two minute walk away. There is a huge mall not too far away. In a nutshell, the stay was great and I can only recommend it to anyone who is looking to explore Istanbul or those that need to be outside the Schengen area before flying to the US! ;)
I hope I'll meet Onur and Yousef again! Very kind-hearted and open minded people, packed with knowledge about history, culture, and religion for those interested!