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Of course it's optional, but yes, there are generally slippers in the bathrooms of houses and apartments here for you to wear while you are using them. Nobody wears their shoes inside here, though. They are always taken off in the foyer as you enter the house. You can then wear slippers in the house if you want to. These slippers are different from the toilet slippers. Many people just move through their houses in socks, though.

Alright nice, well I heard a lot about it. But in general I think it's much more hygenical)) thanks for your reply

Personally, I don't bother putting the toilet slippers on at my house, but I do at other people's houses. I don't know if that's normal or not. I also know that when visitors come to my house they use the slippers in our bathroom because they get moved to a new place.