Highly recommended!
I had a wonderful stay at Ivos' appartment, a nice, clean and convenient place with a perfect location. Not only is the city centre within walking distance but all types of public transport are at hand to give easy access to the whole city or even more distant destinations such as Spandau, Potsdam or Strausberg.
Even if I had no personal contact with Ivos, all our exchanges were very agreeable and efficient.
One last thing... noisy? Yes... but what can you expect when being in the heart of such a large city! I have to add that I didn't feel the need to use the earplugs kindly provided by Ivos!