I cant recommend this place enough! It's situated perfectly in beautiful Prenzlauer Berg and the apartment itself is spacious, well equipped and really really nice to spend time at. Both Henrik & Sven are great with communication and always willing to help. Getting to the apartment is quite easy also: its about a 20min walk from Alexander Platz, where the txl bus from Tegel airport drops you.
Stay here, trust me, you wont regret it!