Sandra's apartment was perfect for my working week in Berlin. It's well-equipped and perfectly located.
Located: in Mitte, with U-Bahn 6 literally at the door with good connections at Friedrichstrasse and elsewhere to the rest of the network, and a one-block walk to four tram lines. And, really, walking distance to anywhere in Mitte.
Furnishings comfortable and well-arranged, really almost like three rooms; kitchen fully-equipped including dishwasher. And, unusual, a washer that's also a dryer! There's an air cooler for the bedroom area, although I never used it; even in 90+ heat, opening the large front window and turning on the fan kept it comfortable.
Sandra was very quick in response to messages.