Wonderful, very cute apartment close to Bergmannstraße. It is exactly as described and I would always come back. I spent 4 days working from Katrin's apartment, Internet worked well. The kitchen is small, so don't expect to cook big meals, but perfect for making pasta or heating a soup.
The only thing to keep in mind is that you are in the basement and there are people above you that may (or may not) be noisy in the evening - I experienced both. Katrin has little influence here so no criticism on the apartment.