Studios in Rome & Paris - Senior Amateur ballroom

Could anyone suggest "serious" ballroom dancing studios in Rome and/or Paris, where senior amateur dancing is well-developed and possibly such studios have group lessons for senior amateur ballroom dancers? Thank you!
I'd like to piggyback a question on this. Does anyone have any tips for finding good coaching for short periods in cities you are unfamiliar with? I will also be abroad shortly, and don't have friends in the cities I'm visiting that I can get recommendations from. The trip is long enough that I definitely want to do some dancing while I'm there. Plus I hear great things about standard in Germany.

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