If anybody is interested in while visiting Paris or Madrid to sit in at a convival group and speak only Spanish,then these are groups that meets regularly in both cities.
In Paris, below link, there are from many nationalities who have a common bond for the Spanish language.
http://spanish.meetup.com/728/?gj=sj6

In Madrid,
http://spanish.meetup.com/15/

I am active in both, great bunch of folks again from many countries,common denominator is to speak and learn about Spanish and our world. IF you need more info as to how the groups are, let me know.

this is our latest hunt eating paella in Paris with the Paris group, I am in with glasses 2nd on the left.