Gassho-zukuri farmhouses booking

Your website recommends staying in gassho-zukuri farmhouses in and around Ogimachi functioning as minshuku.
1) How can I book this type of accommodation?
2) Is this minshuku available for single accommodation? Is it recommendable for one female?
3) What is the rate for a night with breakfast & dinner?

How can I book this type of accommodation?

One of the two options:
http://www.japaneseguesthouses.com/db/shirakawago/index.htm
http://www.shirakawa-go.org/english/e_hotel.html

2) Is this minshuku available for single accommodation?

At least some of the minshuku should be able to accommodate single travelers. Especially in the off-season.

Is it recommendable for one female?

Yes, why not?

What is the rate for a night with breakfast & dinner?

Around 8,000 to 10,000 yen