Jonas is an amazing host! We had a wonderful time staying at this apartment. So close to Galata tower and Istiklal street (one of the busiest shopping streets of Istanbul). We also enjoyed our place cleaned up every week by Dilyara (not included with the Airbnb).
If you are planning to book a trip at this place, I highly recommend it. Just remember to get extra/larger data plans from your cell providers as WiFi can be quite spotty (most of Beyoglu is like this I think).