Great host and great apt great location. If you want a place for your family in the heart of Berlin this is a great choice. The apt was well equipped and the jetted tub was awesome. Having a baby crib and a wii with mario cart for the kids was a nice touch. Wifi worked great and the elevator was a nice option. All in all the whole family was pleased.
2 pieces of advice:

1) get detailed directions when meeting for the first time, it will be a longer walk if you don't take the train station exit that leads to the big metal bridge. (5 min one way 10-15 the other)

2) Air out the apt if you cans during the day, it's pretty common in europe to need to get some fresh air since the heat comes from the radiators and there is little air flow and can get stagnant

Other than that if you need a place to call home in Berlin this is a great choice!