Yunus Emre was a great host. He responded to all the messages very fast before and also during our stay.
The place was in a good location. Karakoy location was a good choice because we could walk to most of places we visited in the historical area of Istanbul.The entrance was a not so good but no big deal. The bathroom was full o stains and quite old. The sink had a problem with the drainage and Yunus Emre handled it right away. Iron was one missing amenity the day we arrived and one pillow had stains on it but Yunus Emre brought both the next day of our stay. I am not sure whether the air-condition was a problem but we found 2 types of heaters (1 electric fan heater and 1 electric infrared heater) in the room and the electrical fan one was already working when we arrived. The heaters were not so good to use.
Overall: Great host, good location, not so good regarding cleanliness and not so good regarding heating.