ah,
thank you for the reply.
But with the two ways mentioned above something went wrong. They are following the outer way of a residential polygon and are also part of the relation. Do you want to fix this by yourself?
https://www.openstreetmap.org/relation/17666969
The area will show up again after this ways are removed from the relation and from OSM. 
Yesterday I straitened the foot ways around the CUT Hostels. Is this ok.

