Stayed here overnight on advice from the locals. There are potentially security and falling (rotten) tree issues closer to the crag. Ignacio (climbing guide) and his cousin (Poncho, who speaks excellent English as he used to live in America) were very accommodating. It was free to stay with them in their yard. Toilet facilities are basic.
The crag itself is "challenging" in that it is significantly undergraded and there are safety issues around many of the bolted routes. You need to bring your 5.10 lead game if you're going to get much done here. The rock is monzo-granite and has a distinctive Jtree look. And access is less than 50m from the carpark. MP has good topos.
If you're looking for something more beginner/moderate, then TePopote near La Primavera about 10 miles east of Guadalajara is well worth a look.
Place: pulqueria tattoo hostal
Location: 20.78569, -103.39922