We rarely stay in fancy hotels when we travel so these tips apply if you are on a budget like us.
If you like to use a washcloth then take your own with you. These are not usually supplied in many European countries. I take small baby washcloths that dry much faster than the nice thick plush kind.
I take a wash bag with a hook that can be hung on a door handle or hook. Bathrooms with little or no counter space are quite common.
In Greece and in some small towns in other countries you will see wastebaskets for toilet paper. The sewers in some areas do not handle toilet paper well and it’s best to do as the locals do if a wastebasket is provided. There is often a sign.