Do not pay over 800 USD without looking at sahibinden.com or other websites first. The price is "tourist taxed," by an extremely significant amount... That said, here are my thoughts:
Pros:
wifi (100mbps upload/ 75 mbps download - great).
General location is close to groceries, restaurants, shopping, and metro (10min walking)
Hasan is very helpful.
Cons:
Bugs love this unit; must come in from the bathroom window that is required to stay open.
Sewage smell from the bathroom.
There is not enough space.
The trash can is half broken (you'd be better off just using grocery bags).
There is an orange stain on the mattress near the head of the bed (who knows what it could be).
The water pressure is very very low, sometimes it barely runs at all.
The walls are very thin (you can hear everything going on outside - including party people from around the area, cats fighting, and a bird that caws nears the bathroom window haha).
Ah, and when you leave/come back you will be greeted by the scent of aged cat urine/turds.