The flat is great, much prettier in real life than on the photos. It's bigger, with a lot of space in the living room and also two bedrooms. The interior design is awesome, and the outside view is sophisticating. Hot water is stable, kitchen has all the equipment, a big tv with an HDMI cable, a lot of towels, pillows, sheets and so on.
Location also hadn't let me down. Centre of the city with lots of cafés, shops, tourist attractions. However to get to Osmanbay subway station you have to get up on the hill, which makes you really sweaty ))
Host is very kind and caring, getting keys was easy.
So have no doubts if this apartment is vacant while you visit Istanbul, it really worth it.