PROS: The apartment is really close to the underground services and the host is very talkative and available in time of need.
CONS: The apartment is really close to Tegel airport, hence you can hear flights landing every five minutes, till late in the night. You can close the window to cut off part of noise, but unfortunately I was travelling in August, hence it was too warm to keep the window shut. Moreover the courtyard of the apartments, during my stay, has been used by the other guests to party till late night, without letting me sleep.