I stayed with my sister at Daniel's apartment for 7 days and we just loved!
The house was completely clean, the bed had clean sheets, the kitchen had all the equipments needed to cook and everything was okay with the bathroom and living room.
Regarding Daniel, he's definitely a great host, always ready to help you with anything you might need and it's really easy to get in touch with him.
The apartment is located at a residencial area which means that it was the perfect place to rest after a long day in the city of Berlin. It's very calm, has a lot of street shops, it's near a little shopping center and it's also about a 10 min. walk away from Treptower Park S-Bahn station. So it's very easy to get to the center of the city from there.

I would definitely stay there again and I truly recommend this apartment to everyone who wants to visit Berlin and then have a cozy and private place to rest! :)