Stefan's apartment is AMAZING! Its super clean and fresh, it has an amazing bathroom (!!), a fireplace, HEAPS of space, a great kitchen, its in a really great area of Berlin - lots of places to eat and drink, a big supermarket across the park that you can see from your window, great coffee around the corner (called Antipodes) and super close to the centre of town. What more could you want??
Stefan is very helpful, always quick to respond, even though he was travelling abroad himself, and very hospitable. I didn't get to meet him face to face, but he seems like a really great guy and an amazing host. I would definitely stay here again and recommend it to anyone travelling to Berlin.