Potes or Cangis de Onis would most likely make a good base depending on what you want ie: they are both touristy towns with plenty of accommodations and restaurants etc. Loads of nice scenic motorcycle routes abound in the area.
There is also lots of nice villages in the Picos area without an abundance of facilities. Michelin 572 Asturias & Cantabria is a good map for the area
July and August in particular are not the best months to visit as it is the busiest season for tourists in the area with a huge influx of Spanish visitors escaping the heat in the southern areas of Spain
As regards trail bikes and trail rides, in my experience of recent, nearly all the trails are now prohibited in this area except for local access.
I have been in the area on twenty five occasions in the last several years
PS/ If you have Garmin Map-source on your PC I would have a lot of way-points and routes for the Picos area
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