Popular tourist hot spots were included in the exclusion zone including Piccadilly, Knightsbridge and Oxford Street, between March 26 and 28.
The crackdown targeted begging, street gambling, rough-sleeping and other forms of antisocial behaviour in a multi-agency initiative.
Romanian police officers accompanied their London counterparts to assist with translation when required, and in other fields.
Marble Arch and Park Lane also fell within the dispersal zone as intelligence showed those caught begging there are returning to rest for the night, and complaints of antisocial behaviour have been made to the police and local authority.
Inspector William Hodgkinson, from Kensington & Chelsea police, said: “This dispersal zone was set up as part of an approach aimed at reducing the number of those sleeping rough and begging, which can lead to associated antisocial behaviour and crime.
"Assistance was also provided to vulnerable people in need of help."