The apartment is very close to the city, easy to find and the building it is in feels safe.
the Sofa/Bed was extremely comfortable, and the kitchen had everything one could need! I used the microwave, coffee/tea machine and even the washing machine
The shower was really big and the water temperature was easy to adjust
The place was nice for the short stay I had planned in Berlin
You will have to coordinate with the owner on how to pick-up the key (no key box), which can be stressful if you are going to Berlin by train, since they are often delayed
Other than that, it was a nice experience