Hi, 

thanks for the heads-up! The next time I'll create a new node instead of moving a node around.

I don't understand the comment "on the CoLab node the address is still the old one". When I look at the node (https://www.openstreetmap.org/node/9417572505) I see the new address in the tags that I submitted with the changeset.

It's unclear what the owner of the house will do with the former rooms rented by CoLab. The contract ends at the end of the year, i.e. CoLab still pays for the old rooms in December, but it has already moved its business to the new location. The rooms at the old location are mostly empty.

You ask "And: the cafe that is mapped in the new location: does it still exist?". Do you mean Café Sunshine at the old location? Or the apartments at the new location? Café Sunshine will cease to exist at the end of the year. And the apartments are still there at the new location.