Many thanks for your comment as this is a possibility to point out some characteristics of the apartment in better detail, giving some tips for further guests which can make a stay in this cozy place easier.
As we noticed in the description the apartment has only one bed room with a double bed and one sofa bed in the living room. So you are right when you say that this is not the best place for longer stays of flat sharing communities with colleagues. We thought to make this clear in the description and the pictures and we are sorry, if you expected something else.
A further point is that communication can be very helpful as you told us you would come alone, therefore no further key seemed to be necessary for us.
After telling us that another person had arrived, it took us 2 days to make a copy as we had no other one in reserve. If you had asked for the other bedding, we could have told you where it is (bed sofa).
As we are new on air bnb it was a good learning for us to get more proactive in touch, communication, with our guests. Especially when they want to stay as room mates in an apartment with only one bed room.
Best Regards, T.