We used this flat to stay nearby Mitte and a relatives house. Accessing the unit is quite simple, from Berlin Hbf you can just take the M10 east to the apartment.
Nearby is a park for kids 2-8yr, easy, safe walking to cafe/bars etc.
The flat has a simple patio to enjoy fresh air and cup of coffee. Partial view of the TV tower.
Beds are more similar to futon/pull out mattresses than a spring mattress. Master bed is quite squeaky if you and partner are light sleepers. With the windows open, this area of Berlin is quiet enough except for the occasional siren/ambulance.