Olivier's flat is one of the nicest I have stayed in in Berlin- spacious, well equipped, light. There was a problem with the internet a day or so after I moved in, at a particularly tricky moment for me. Olivier worked hard to get the fault sorted out.
If there was a problem with the flat is is that it was occasionally susceptible to noise from various other apartment - although this was not extreme or prolonged, and so, on balance, not a reason to pass up a very attractive flat in a fascinating and under-rated area.