My boyfriend and I had an amazing time in Berlin and found the apartment was super central to the rail line and within walking distance (30 mins) to most things. There are several different styles of apartments so be mindful you may not get the ones listed in the photos but they’re all big, bright and open.
The place is so quiet and peaceful - best nights sleep either of us has had in forever. The bed is really comfortable and everything looked clean.
Previous comments have mentioned the staff to be rude but the hotel staff and management are lovely and nothing is too much trouble. The cleaners on the other hand are quite abrupt and harsh and so this might be who others were referring to.
There are irons in reception so just ask for one if you need it for your room and nothing is ever too much trouble.
Also big recommendation to anyone going to Berlin to go to the TV Tower for dinner. Incredible views!