Alex was simply an all around great guy - very knowledgeable and ensured we saw as much as possible in our limited time in Havana.
In addition, I contacted Jorge pretty much at the last minute prior to leaving Canada. Communication was excellent and I was very happy that Jorge was able to arrange things for us at such short notice.
Payment terms are in cash at the end of the tour - I didn't ask but I don't believe Jorge or any of his associates take credit cards. We also used Jorge's driver to/from our hotel in Varadero at a cost of 90 CUCs each way (outbound trip paid to Alex with his fee, homebound trip paid directly to the driver).
To contact Jorge - firstname.lastname@example.org
Please don't hestitate to ask questions or PM me if you need more info.