I wonder why Abramovich chose that office, some historical link to Cyprus no one has heard of?

Cyprus deliberately set out to make itself attractive to wealthy Russians in the 2000s and 2010s.

Various controversies relating to bailouts after the financial crisis, the rise of anti money laundering controls in the late 2010s, and the Ukraine invasion have severed many of the ties but Abramovich was just one of many to take advantage in the past.

https://www.politico.eu/article/cyprus-is-losing-its-russia-... has a reasonable summary of how the relationship developed.