A friend of mine is wondering if a Spanish speaker speaking Spanish in Rome would be understood by Romans.
I’d guess not. I know that it works between Catalan and Italian - at least it used to work for friends of mine, one would speak Catalan and the other one Italian, and they obviously had no problems communicating. I don’t think it works between Spanish and Italian.
We wouldn’t mind a native speaker confirming that. Or telling us that we’re wrong.