Andorra is a great country, but it is quite hard to access. It has no airport, Therefore, the best ways to get to Andorra involvement will probably travel to Toulouse or Barcelona, and then Andorra. Ook Andorra does not have a train network, so you will need to take a road. However, the country is wonderful and worth going.
For those willing to go toulouse to andorra by bus or train, the best option is to fly to toulouse, and either take a direct bus to Andorra la Vella, or a train to the order, and then a bus into the country.