Nice place, sunny and spacious. There is also a piano! Katrin and Petra were very communicative hosts. (Note: there is no microwave, so try not to keep food leftovers)
A tip for entering: the street number outside is half peeled off, so it looks like it says 31 instead of 30, but it really is 30. You want to go in the LEFT door (bigger one), and this will take you to a courtyard. The correct building is on the right in the courtyard. If you have entered a building directly from the street, you are in the wrong place! It is dark at night, so bring your phone flashlight. Also, pull the door toward you when trying to unlock it or the lock sticks.