We had a successful stay at Jennifer's place. Check-in was super easy, as the keys were left for me at a cute cafe near the apartment. My first meal in Berlin was soup and gelato from Cafe Roberta. :) The apartment looks just like the pictures. It is located in the clean, safe area of City West, next to tons of shops and restaurants. Train, underground, and bus stations are all within walking distance. It takes about 20-25 minutes to get to most places you will be visiting in Berlin.
Jennifer left fresh fruit and chocolates as a welcome gift, which was helpful for breakfast our first morning since we didn't have time to go to the supermarket right away. There's a grocery store just across the Ku'damm (I could be spelling that nickname wrong).
The stay was very nice. The only suggestion I could give is to maybe add a fan because even with the windows open, it did get a tad stuffy when it was rainy and humid. We are used to hot weather though, so we managed and later the weather cooled down.