We stayed at Maria's place for 4 nights and had wonderful time. The apartment is more spacious than the pictures suggested, and was perfectly comfortable for our stay. The location is excellent. It's only a few blocks from Friedrichstraße and Friedrichstraße U-Bahn and S-Bahn stations, which give you easy access to the rest of the city. Maria was a kind host, and she helped us settled in when we arrived. We would gladly stay at her place again next time we are in Berlin.