Güner was friendly and very responsive (always replied immediately), while his brother, Güven, was a great host, trying his best to accommodate me and giving me tips in the area. Their principle, I believe, is to do whatever they can to treat people well. Can't ask for more.
The place itself is just like a hotel room, just as it was pictures, if not better. Location is great, just a few minutes to Taksim square, and lots of restaurants nearby.
However, the only downside is the instruction after getting off the bus at Taksim square wasn't quite as suggested. And I had quite a terrible yet unlucky experience about it. Other than that, this tandem of brothers-partners just makes everything works!