The PDF you quote describes the intended ideal conditions. In Germany also every prisoner is entitled to have his own cell and each cell has to have a separated

The PDF you quote describes the intended ideal conditions. In Germany also every prisoner is entitled to have his own cell and each cell has to have a separated toilet area. But in practice prisons are full, cells are occupied with 2 or 3 prisoners and toilets are only separated by a plank. Finding work in most prisons can also be pretty hard. There are certain jobs that are always in demand (welder, carpenter, etc.) but if you're a simple academic and not a craftsman you can only hope to get one of the lower level jobs like librarian, kitchen help, etc. That paired with prison overpopulation can make getting a job pretty hard. The problem is that the prison system in Germany is heavily underfunded and that a good portion of the prison buildings are very old (a few date even back to the late 19th century). Germany would need many new prison buildings with humane sanitary standards but you don't get points in the election for spending tax money on the well being of prisoners.