Just returned from a 6 night stay here. Very nice apartment, in a great area, with all supermarkets, shops, bars, restaurants only a very short walk away. In a lovely area, and close to U-bahn. We had an early flight in to Berlin, and a late flight out, so luggage storage for us was an issue. We did however avail of Simón's suggestion of www.nannybag.com and it turned out that the Kiosk shop opposite the apartment was on their list, and they stored our bags for the day, at €6 per bag (not open on Sundays).