The location of this Airbnb is really good for the price. You're just two small blocks away from Hermanplatz, the U7 and U8, as well as on a direct bus route - the M29 and M41, which gives you access to a lot of great places in the city.
The area itself is also very hip: just south of the trendy eastern Kreuzberg neighborhood with plenty of really good restaurants (I recomend Cocolo Ramen and Holy Flat!, among many others).
The apartment is spacious and well-decorated. I only spoke with Nico, Kaya's boyfriend, and Nico was very nice, friendly and helpful. The room has it's own door an extra floor up, in case you want to enter/leave without going through the rest of the apartment which is nice for some people. The wifi is great, and they even have an ethernet cable if you need a fast connection. There is also a nice terrace for when the weather is nice.
I highly recommend staying with Nico and Kaya :)