Me and my two friends stayed at the apartment for 7 nights! It's a great, cosy, big enough for 3 or 4 persons apartment. Everything (wifi, heating, etc.) worked perfectly, it was very clean and tidy and the owner informed us for all the details on time, so we hadn't any problem in finding the apartment and the keys for it. Furthermore, it is placed in a quiet neighborhood (Friedrichshain), which offers many alternatives for food, drink and shopping and it is almost 5 minutes on foot from the U-Bahn and about 4-5 u-bahn stations from Alexanderplatz. It was a great pleasure staying in this apartment and visiting Berlin!