This appartment is really well located, you can almost entirely visit Berlin without taking any public transportation. There were almost no noise, whether from the neighbours or from the city, and the appartment was tidy.
However, the kitchen is extremely small (you can only cook basic meals) and 3 out of the 4 beds are not comfortable. Moreover, you can't even talk from 10pm on with the windows open, as guards will come and ask you to stop talking. This appartment would suit people who care a lot about the location and who plan not to stay a lot of time in the appartment, but not for people who want to go to bed late and plan to prepare most meals together in the appartment.