As above, preferably near the trails! Self catered places would be ideal.

I did check out the log cabins owned by Forest Enterprise, but they seem very expensive.

Not massively close to the trails but really nice, great if you are taking any young family with you as the woods are quite something and access to the farm is neat.

Barn to leave bikes in as well.

http://www.puzzlewood.net/cottagestolet.htm

How many for? Group, family, couple?

This place is handy for the trails: Whitemead Park, Parkend

Try here :

http://www.fodmtb.com/#/links/4566252067

if you still have no luck, drop me an email and ill give you some other options