This is fantastic and accessible bikepacking adventure in the heartland of Spain. Toledo - start and finish - is worth a few days if you have them. The route is beautiful, based on the adventures of Don Quijote, and passes many sites from the book such as windmills, castles and forests. There are some very nice stretches in natural parks and the total distance and elevation make it doable for people with not too much bikepacking experience. There is a lot of (stony) gravel and very little tarmac - apart from one or two hike-a-bikes all perfectly rideable but take good chamois cream!
Also very charming is that it is all very informal and low-key: a challenge rather than a race, which clearly sets it apart from some of the ‘bigger’ events in Spain and elsewhere.
Apart from the many places along the route where you can book a hotel, buy food etc, all the controls have food for you and at some places on the route you can sleep in a sports hall. The organization goes out of their way to help you and make this accessible - but you have to remember that ultimately this is a self-supported challenge and you cannot expect the organization to pick you up if you get stranded with a mechanical or injured. One example - heavy rains had made part of the route inaccessible when I rode. At the checkpoint prior to that section all riders were advised to take a detour.
The people on the ride are super friendly, and the people in towns very helpful. Speaking some Spanish is handy but all information is provided in English and many of the towns you pass through benefit from ‘Quijote’ tourism and thus have quite some people who speak a bit of English. Highly recommended (as I recommend ‘La Conquista’ - along the camino del Cid, organised by the same people).