Kalma was a flexible and communicative host. She arranged for my friend staying at her place to pick up the keys when he arrived earlier than me. She was very responsive to questions I had. The location of her home is great, and it has everything you need for a stay in Berlin.
There were a few issues of cleanliness. I understand when you are renting out your personal home, it can be hard to think of every nook and cranny, as it’s filled with your life and your things! That being said, there were a few things I think a guest has a reasonable expectation to be clean, and they weren’t. I am a fairly low-maintenance traveler, so these things didn’t ruin my trip. I would stay here again. However, if you are expecting a hotel-level type of stay, this may not be for you.