Do learn CATALAN.
In addition of being the official language of Andorra. it really comes handy to make a normal life in the country as an employee and as an employer as well. I believe, without any doubt knowing CATALAN is the best way to have a nice rapport with anybody in Andorra, and specially with the Andorrans who normally appreciate the effort made by people who learn it as a second language.
Besides, there is so much help to learn it and at no cost.
Needless to say that i am trying to do so.
Bona nit.
Txabi