Alex's place is very nice and comfortable in a very quite neibourghhood. The main room and the kitchen are spacious with everything one could need. It is close to a S station making it really easy to move around. There is also a supermarket closeby. Alex gives great instructions and responds quickly and kindly.
Was only surprised by the shower being in the kitchen (it is shown in the pictures but I didn't pay attention to that detail).
I definitely recommend the place to anyone visiting Berlin.