The location of this apartment is amazing. It is in the thick of excellent restaurants and bars, very close to public transit, and walking distance from many of Berlin's attractions. It is without a doubt in a really great spot in the city.
There are a couple of things to note: there is a lot of sound transfer from the stairwell and from the restaurants below the apartment. This makes sleeping in the front room difficult or impossible if you want to have the windows open. When we were there, it was very hot, so we slept in the back room in order to have the windows open and be spared the noise from the street. However, the back bedroom gets wafts of odor from the restaurant's back door. On our first night, it was a strong smell of deep fried oil. On subsequent nights, the smell shifted to rotting garbage (we assume because of the heat and perhaps the point in the trash collection cycle). We were thus in a position to have to sleep with the windows closed. There are two fans in the apartment, both of which are broken. So, sleeping wasn't easy.
The kitchen is not quite fully stocked - for instance, no paper towels, and no vegetable peeler. There is a washing machine, but no laundry detergent (we were unable to find a small package of detergent to purchase). There is no soap or shampoo in the bathroom.
We loved the location, but were disappointed in the apartment itself.