We had a very nice time at hubert's appartment! It is quite well situated, with u-bah all the time, connecting the flat to the main stations in just a few stops (3 to Friedrichstrasse for example).
The flat is very spacious and has everything necessary for many people (2 big beds + a sofa that you can open).
It is clean enough, everything was provided (towels, shampoo, hairdryer...).
For the price, we couldn't hope more and are overall very satisfied. Recommend it.