Ivo rawks. We originally booked another Airbnb in Prenzlauer Berg. The other Airbnb (NOT Ivo's) turned out to have no electricity! Ivo was able to book us on super-short notice and had the place ready for us within two hours of initial contact. He saved our trip, and we would not hesitate to book with him again.
As for the flat, it was clean, comfortable, perfectly located near S-bahn and nightlife, and reasonably priced.