Perfect location, amiable hosts who also own a vegan cafe downstairs.
I arrived in the afternoon and found my hosts behind the counter in their cafe. They suggested me to sit down and offered some water; five minutes later I was unpacking my bag upstairs.
All the issues were solved with the speed of summer lightning.
The hosts also cook perfect vegan food. Muffins are 100% recommended.
Very clean and comfortable (both the cafe and the guest house).
Small rooms, but that's enough for one or two people.
One thing to remember: you will have to take your ear plugs along, because the room is literally five minutes from Taksim, so you will be staying in the club area with music 24/7.