In summary: Ansen is an excellent host that will go above and beyond for you, the Airbnb itself is incredible value for the $$ spent - it is incredibly spacious, with a terrace that has a view of the Galata tower!
Just keep in mind that this is on the 6th floor, and there is NO elevator. Since this is an old apartment, I wasn't able to get hot water either (Ansen I'd ask you to weigh in on this). Despite this, still 5 stars for me because I felt comfortable here with all the room.
Got into some trouble in Istanbul and I thought my trip was ruined. Ansen went out of his way and used all his resources to help me get out of it and made my trip a great one to remember. Can't thank you enough Ansen!! (-: