Charlottenburg can be a very nice place to live, and the apartment is really convenient to a lot of public transport. It is central to old West Berlin but pretty far from what would now be considered the center, and not at all hip, though there are many, many good restaurants and cafes and shopping opportunities nearby. The apartment has none of the classic Berlin charm (high ceilings and grand windows in beautiful buildings) but is instead a stylish and neat modern furnished unit. I don’t know if my experience was typical, but while I was there the owner had left the rental to a management company that was busy and not terribly responsive. If it is a good fit for you, though, you could be very happy with this apartment.