This is a great apartment to stay at while visiting Berlin for a few days, either by yourself or with a partner. It is in the exciting neighborhood of Friedrichshain with cool restaurants and bars, and it has really easy transportation connections. It is ca. 5-10 minutes walk to two major train stations: Warschauer Straße (S+U Bahn) and Frankfurter Tor (U-Bahn), and the M10 tram as well.
Communication with René was also great, and check-in was easy. The bedroom is really big and nicely decorated. There is a washing machine if you need to do laundry, and the kitchen has all the items you need to cook a meal. (The grocery store REWE is also ca. 5 minutes walk from the apartment.)