Overall the apartment was fine, and it served its purpose of being a work space and sleep space while exploring Berlin.
The cleanliness was subpar with several of the dishes in the cupboard being unclean or moldy. We continuously cleaned up large clumps of long hair--despite us being very short haired people--along with large amounts of dust and debris on the floors and carpet.
The kitchen is not well equipped, with the only means of coffee being an off-brand Keurig. While they are not necessary, there is no microwave and no oven.
The location was distinctly loud, with construction in the courtyard area starting around 7 am. For those hopeful that the construction might be done by the time you arrive... just know that it looked very unlikely.
The check in process was difficult, with the instructions indicating the incorrect number of stair flights, which was frustrating to navigate after a long day of flying. It was also difficult to tell which apartment it might be, as all the doors look the same and there was no distinctive feature setting it apart from the many other apartments.