The place is well equipped for few days in Berlin, and for the price it is OK. Nevertheless, be aware that the pictures in the website seem to be taken some time ago (e.g. the couch is significantly worn out when compared to the picture).
One final thing to keep in mind is that even though the building has a lift you still have to climb some stairs (half storey) to get to the flat which may be an inconvenient if you have kids or reduced mobility.