The apartment is in a great location with many excellent restaurants and cool bars nearby. Museum island is a close walk away. Berlin central station is about a 20 minute walk away. Lots of public transport nearby.
The apartment itself is very beautiful, with large rooms and high ceilings. However, it isn't the most comfortable to sleep in. The curtains are thin and let in way too much light in both the living room and the bedroom. There is no air conditioning (extremely uncommon in Germany overall), but we had to buy our own fan to keep cool, as the one supplied only worked on a 2 hour timer. The bedsheets are very rough, the pillows are misshapen, and the comforter is sorta short for the length of the bed. Also, while the apartment is on a relatively quiet street, there is still a good bit of street noise, and a horrible church bell nearby. Maybe in cooler months, when you can keep the windows closed, these issues are not so bad.
Small thing which isn't very important, but there isn't a stand-alone dryer. It's a combination machine which still leaves the clothes quite wet. Not a big deal, but just something to note if a real dryer is important to you. Again, this is quite common in Germany. There is a drying rack.