Sa majeste la reine Nathalie de Serbie 1859 - 1941 a habite dans cette maison

English translation: "Her majesty Queen Nathalie of Serbia 1859 - 1941 lived in this house [AWS Translate]"
This is an approximate position

11 rue Royale, Paris
[geolocate this address]
Google Streetview OpenStreetMap

Colour: grey

Wikimedia:

Flickr: