I loved this place. It was so interesting to see and hear how they make it. They use some machinery, but it is very small-scale and much of the process is by hand. The tours are in Spanish, unless you arrange through a tour operator (some of which are quite expensive, so if you understand a bit of Spanish and are on a budget, you should just go on your own). A taxi shouldn't cost more than 20 Cordobas per person from Matagalpa (it is just outside the main part of the city). They don't do all parts of the process every day, so it's a good idea to call first to make sure they are doing tours and go in the morning because by early afternoon, they are finished making chocolate for the day. There is a sample at the end of the tour and a coffee, a very nice touch.