Charlottenburg is a great little area with parks, markets, shops and relatively close proximity to the train stations. Taxis are very easy to get as well.
I wouldn't stay here if your wanting to just see the charlottenburg palace as the outside of it is not that great and I never figured out how to see inside as it always looked abandoned and most locals I talked to didn't call it a palace. The opera was amazing which was only a 15min slow walk away so I totally recommend this.
Brandenburg gates, and the Reichstag was only a 10min drive by taxi and cost £16 which was one of the cheapest taxi rides I took while in berlin.
On arrival to Berlin I got ripped off by a taxi driver who charged me £25 for a less than 10min drive from the airport so either negotiate approx £15 or have the meter running so you dont experience the same. To get to the easy side gallery it will cost you approx £40 so if you can find a cheaper alternative that would be ideal.
But the accommodation while not completely finished being renovated as yet it was clean and tidy, safe with modern bathrooms, kitchen and shared communal areas.
My bed was so soft and warm and I didn't want to get out of it.
So overall I did enjoy my stay in berlin and the apartments was perfect for me for this trip.