The location is extremely good as it is just right next to the Karlshorst station. There's a coffee shop and a supermarket on the ground floor. There are also washing and drying machines in the basement.
I stayed there for 5 nights. The first day was not feeling good. The water from the shower was cold, and the hair dryer was so dirty. As the reception only operates in quite limited hours daily, even though there's a pretty good whatsapp AI communication channel to answer general questions, the above problems couldn't be solved until the next day. Besides, there's a bit of bad smell each time entering the room, but it's toreable.
Overall, considering the price and the location, this hotel is a competitive option for business or travel trips.