The apartment was very clean and everything was exactly like the pictures posted to the airbnb website. The apartment is connected trough a door to the main apartment where the owner lives, but it has a separate entrance so you can come and go as you please. The bed was comfortable and provided a good night sleep. The shower provided enough pressure and we did not run out of hot water.
In overall, I have to say that the room is superior to most hotel rooms I have visited during my travels.

We were having the breakfast with our hostess during our stay at the apartment. The breakfast was served at the main apartment at our time of choosing. I can definitely recommend on having the breakfast, as it was really good. The breakfast included omelette, coffee/tea, freshly baked bread with all the typical toppings (ham, cheese, etc...), and exceptionally good fruit salad from fresh fruits (not canned ones). Alice (our hostess) would have also made us anything we liked, but we were more than satisfied with the offerings.

The location of the apartment is really convenient. It is located on a very quiet street so there is no traffic noises coming to the apartment. The nearest metro (u-bahn) is located few hundred meters away, so you can quickly get anywhere in Berlin from the apartment. There are also some decent restaurants nearby in case you want to dine in the neighborhood.

The hostess (Alice) made us feel very welcome from the first moment we met. We had nice discussions with Alice during our
breakfasts. She was happy to answer all our questions and provide us with information on Berlin (sights, tours, public transportation etc...).

All in all, I can honestly recommend this accommodation for anyone staying in Berlin.