Altug is a really cool guy and an awesome host. Very friendly and responsive. His apartment is awesome - and it's in one of the best locations in Istanbul. Lots of cool cafes, bars and restaurants around.
Also, if you're working remotely, this place has the best WiFi! I've stayed in a number of places in Istanbul and the internet is average at best, but Altug's place had fast and stable wifi throughout my stay. I was on multiple video conferences almost every day and the wifi didn't drop out or slow down once, which is extremely rare for Istanbul!
Overall, highly recommended! Great host, great apartment, great location and 5 star wifi :)