The apartment was cheap and it should be. I had issues with a late meeting for key handover which meant I had to find somewhere safe to wait 30 minutes. I also had problems with using the door keys the next day and had to wait 90 minutes for someone to arrive and sort it out. Eventually we got a satisfactory solution. The staircase is very run down and the apartment block is quite scary.
On a positive note it is very handy to easy to negotiate public transport and it is cheap. The room looks like the photo.
I think a bottle/container of milk and a compendium about local Berlin would make a big difference. Also a contact who knew the apartment well and was not late for key handover would be great.