There is no neighbourhood called London in Ljubljana. Unfortunately, this error propagated even into official sources such as https://zemljevid.ljubljana.si/web/profile.aspx?id=Javni%40LJ_MZ&initialExtent=464024.83%2C99044.55%2C0.26458

https://urbinfo.ljubljana.si/web/profile.aspx?id=Urbinfo%40Ljubljana&initialExtent=464036.77%2C99031.6%2C0.26458

To make matters worse, as opposed to OSM, these sources rendered this name on a hill.

There is indeed a building planned with the name of Vila blok LONDON S10 Ljubljana Rudnik as can be seen here: https://shglobal.si/london/
But as far as I understand, this could only be tagged as a "name=" value for the building tag. 