Hi Anna, thanks for your reaction. I am glad you enjoyed your stay! The lounge in the living room isn't meant to be used as a bed... As you mention, it is too small to sleep comfortably on it. This is why there is no linnen for it.
As far as size goes... I see how it could be seen as very small from an American perspective. All the other (similar) apartments in the building are actually occupied by couples who live there fulltime... Living in a small space, in an overpopulated part of the country, I guess is part of the Dutch experience. :)