My bathroom smells badly. 

You can ask for a repair request at the website of De Key. Unfortunately, we have seen that this can not always be fixed. However, when more people show their problems with this, the Key will help sooner.

The shower drain is clogged.

When the shower drain is clogged, you can clean it by removing hair and other things. Most of the time this will solve the problem, but you can also disconnect the tube that connects the sink and the drain and clean this as well. If the problem still remains you can report it via

The shower spray is very harsh.
There’s a lot of chalk in the water in Diemen. Putting the showerhead in a bowl with vinegar will dissolve the chalk.