While we never met Max, Friedrich, who takes care of the room, was exceptionally friendly and helpful. We stayed for 3 weeks and found this apartment not just to be affordable but also so well situated and comfortable that we could hardly bare to leave. The canal is right out side your window as is the Turkish Market on Tuesdays and Fridays (a very very excellent advantage of this place).
The apartment is right on the U-8 and is very close to the U-1 which makes most of the city easily accessible in under a 1/2 hour.
We highly recommend this apartment.