We stayed in the The Bella Souterrain apartment for one week on a trip to see our daughter who was studying in Berlin for the semester. It was just perfect for the four of us. Doerthe and Cano met us at the apartment and gave us a tour. These hosts were super warm and lovely and I would rent from them again in a second. They left their contact information prominently displayed on the dining table, and although we never needed to contact them, it was nice the know the information was close at hand. Doerthe had been very quick to respond to a couple of email questions I had before our trip.
The apartment is exactly as described and is even better "in person." The beds were comfortable with nice linens. The appliances, including a washer and dryer, are in excellent condition. The apartment was very clean, cozy and comfortably furnished. There were plenty of bath towels available. Best of all - the hosts have coffee and coffee filters already in the apartment! Plus a few bottles of wine - although we didn't spend enough time in the apartment to enjoy a glass ; )
Although the apartment is in busy Kreuzberg, it was nice and quiet at night, especially when we lowered the metal blinds. The neighborhood is a great base for exploring Berlin with UBahn access just a half-block away. I had planned to cook, but with all of the great, inexpensive restaurants nearby, plus the market hall a couple of blocks over with lots of takeout options, it didn't really make sense. We did shop at the local Kaiser supermarket for breakfasts and snacks.
I would not hesitate to recommend this apartment and would rent from these hosts again.