I stayed for 4 weeks at this apartment in Berlin. Blanca and her flatmate were both very friendly and hospitable, and Blanca answered my questions about the local area when I first arrived. The apartment is located in a nice area that's just 2 or 3 minutes walk away from tram stops and a 10 minute walk from the S bahn. Getting into the city (to Brandenburg Gate and other tourist attractions) takes about 30 minutes in total. There is also a Lidl and a Netto a short walk away if you need groceries while you're there.
The room was really big and spacious and the bed was comfortable. The apartment also stayed nice and cool even when it was 30 degrees outside. The wifi was sometimes slow but worked well most of the time. I really enjoyed my stay in Berlin.