The apartment is well-located and very clean, but we were disappointed by the poor quality and comfort of the furnishings. I estimated that the host spent approximately a total of 500€ furnishing the apartment at Ikea including the cheapest possible spring mattress (159€ including mattress, foundation, and bed frame). Given the relatively high price per night of the listing and its description as "luxurious" I naively assumed that the furnishings would be better than what you might find in an apartment for cash-strapped university students. The photos are not inaccurate but if you are not familiar with Ikea furniture (I was not), take a closer look.
We tried sleeping there one night and since the bed made our backs hurt we decided to move to a hotel for the rest of our weeklong stay in Berlin. The host was at least accommodating to allow us to shorten our stay but we still ended up paying (after cleaning and Airbnb fees) as much as two nights in centrally-located Berlin four-star hotel.
As other guests reported, the wifi was very slow and the kitchen lacked basics for cooking.