I came into this unit with my mom and sister and her two kids, 6 and 8 years old. The check-in process went smoothly. There was a clear instruction on how to get in and Yavus sent us one of his friends to help move our luggages (we had about 10 luggages). The apartment was clean and well-maintained and the WiFi here was fast as advertised. Finally, the location was also very convenient as it was close to the famous Taksim square (10 min walk at most) and Kabataş iskelesi.
Yavuz was an accommodating host responsive to our needs whenever we had concerns. First, he allowed us to check-in earlier than the specified time which we very much appreciated. He also allowed us to check out later than the airBnB time since our flight was scheduled at night and check-out at 10 am would've been difficult.
The only suggestion we have is fixing r replacing the flat door since it'd sometimes get stuck whenever we tried opening it.
Overall, we highly recommend this apartment for future traveller's in Beyoğlu.