Hasan is very responsive and kind host.
The apartment is lovely and spacious, brilliant patio and the kitchen very well equipped (ideal for those who like to spend time cooking-like me-).
Although, be aware that the apartment is on the - 2 floor so it can be dark and you will need to use artificial light at the entrance, kitchen and bathroom at all times. I was there on September (where most days were sunny in Istanbul) and this was the case.
Hope this helps!