Hi, caminando,
Just last week I heard directly from Javier that the Tres Cantos albergue is right in the ayuntamiento (town hall), which makes its location easy to find.
But, since the distances in the CSJ online guide start at the Iglesia de Santiago and not at the Plaza de Castilla, starting at the latter place makes it a very do-able first day to go from Madrid to Colmenar el Viejo, which is what I now hope to do. If I'm energetic upon arrival into Madrid, I'll walk the first little chunk (less than 7 km) from the church after getting my sello to the Pza. Castilla while battling the urge to sleep after an overnight flight.
Anyone else planning to head out from Madrid around May 17? Laurie