Yeah, this seems to be the Grosvenor Hotel in Victoria, London:

"In 1898 Zola was tried in Paris and on 18 July was in imminent danger of being sentenced to imprisonment. He and his friends decided that it was best for him to escape to England, which he did, arriving at Victoria station on the morning of 19 July. He stayed at the Grosvenor Hotel where, registered as M. Pascal, he was “… given a room on the fifth floor, whose window was blocked by the fretwork frieze which adorns the huge building …” {Zola letter quoted by Rosen}."

https://www.londonremembers.com/subjects/emile-zola

https://www.londonremembers.com/sites/grosvenor-hotel-14-heads