Berlin has a good public transport system that is easy to use. It is just a three minute walk from Yael's appartment to the nearest U-Bahn station, from where you can travel through the whole of Berlin and even further i.e. to Potsdam (1 hour). Travel to the museum island within 30 minutes. The appartment is also close to a variety of shops including a medium sized supermarket.
Berlin may be busy but Yael's appartment is very quiet. Sitting outside is possible. Bathroom excellent.
Great starting point to explore Berlin!