On the plus side:
- Great location really close to Galata tower, lots of cafes and shops nearby, and great views.
- High ceiling, great light in the rooms, big couch
- Lots of appliances (however we only used the coffee maker and kettle)
- AC in bed and living rooms
- Very responsive and helpful hosts
On the minus side:
- AC in living room did not work
- 2 double beds, but only 2 chairs, 1 stool and a tiny table. (We always went out for food, but if you wanted to cook for 4 this would be an issue)
- No shutters on the south-east facing windows made it hard to sleep past 8-8:30. But that might not be an issue for you.
There is room for improvement, but we felt at home and it made a great home base for exploring Istanbul.