I would be very careful. I read a couple of months ago that the authorities in Berlin had put a ban on whole of property renting through airbnb for holiday type lets. They will impose a fine of up to 1OO,OOO euros on property owners who defy this ban. There was a tv program last night in the UK which stated exactly the same thing. I also read, but have not heard anything further, that some areas of Paris are looking to impose something similar.
The problem seems to be that many landlords are no longer renting their properties to local families and long term tenants, instead they are looking to maximise their profits through airbnb and similar agencies. As I understand it, there is no restriction on renting our rooms in the home you live in.
If there are listings for whole properties in Berlin, you might want to think carefully about booking.