Mixed review. Bernardo was communicative and met us at the apartment to let us in; check-in went just fine. No problems there. The apartment was as shown, clean and the kitchen had everything we needed for our family of 4.
That said, Kreuzberg is big, and the particular neighborhood of this apartment is noisy and dirty--the cops looked like they were in the middle of arresting someone out front the day we showed up. The apartment building is run down--other residents leave their trash in the hallway for several days before taking them to the dumpsters. . .which are themselves overflowing.
The bathtub/shower is miniscule--the shower curtain sticks to you constantly as you try to shower. And the beds are creaky.
If you really need to stay in Kreuzberg the apartment will work--it's close to the U-Bahn, but for the price per night I'd find something else.