Nice flat and a very nice host and building manager.
One thing that one should know about is that the flat is located close to the galata tower which leads to alot of noise during nights. We woke up a couple of times in the middle of the night because of this.
I also think the description was a bit off, we did not have an extra room for example.
But overall I would recommend the flat mostly because of the great location, cleanliness and a very helpful building manager.