The main rule is that you leave the apartment as clean as you found it.
Our stay at Ethan's was very pleasant. Ethan was very nice, and made the effort to make sure everything was okay, and to see if we needed anything. The apartment is spacious and gets a lot of sun in the afternoon. The location is also good, in an interesting and quite multicultural part of Berlin, with plenty of bars and restaurants. All in all we enjoyed our stay a lot.
Ethan has a great apartment in a great neighborhood. I really loved my stay here. The apartment has everything you need including a adequately equipped kitchen, washer, bathtub, comfortable bed, and an amazing amount of light. I was more than impressed. The apartment is on a busy street but high enough that I was never bothered by any noise. Although I did not meet him personally, every interaction over phone and email with Ethan was great. Ethan was responsive to any minor concern that arose. He was in NYC while I was in Berlin, but was very communicative and helpful. The neighborhood is prime for people who want to be away from tourist but still in a very international neighborhood. I speak laughable German but didn't have a single problem communicating to anyone in the neighborhood. A lot of great food, coffee shops, great bars, and great people. I would say it's a better area for younger people but would be great for anyone. I never felt unsafe at any hour.