The apartment was very clean and a good amount of space for 4 people. The place was also conveniently located for transit by bus or by U-bahn, and on a weekday it is quite fast to Berlin's central station. Wifi in the apartment is serviceable.
Overall we thought it was good value and a pleasant stay for our time in Berlin. Tom and Arzu gave helpful recommendations and transit tips, and also did a load of laundry for us. We had a bit of miscommunication with the check-in but Tom and Arzu made an effort to match our schedule and were great hosts during our stay.